Malicious PDF — malware analysis report

Static analysis result for SHA-256 0315f6e11d4cc0cd…

MALICIOUS

PDF

127.0 KB Created: 2021-06-03 12:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e35e24a3c8ed359bf68e89dbc7958596 SHA-1: 766a867b498e2e817e2897feb43cc9eb207d10ae SHA-256: 0315f6e11d4cc0cd7a8d95ff7f243abbed6511c6acfe9cee76c95a850bcfbfd1
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/rukatax.pdf.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/pbw?utm_term=english+phrasal+verbs+in+use+advanced+2007+pdf PDF link annotation
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/rukatax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388046/normal_6048fe6338bd8.pdfIn PDF document text
    • https://dexisuliraj.weebly.com/uploads/1/3/5/3/135346252/54e91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483072/normal_5ff1c9d01e738.pdfIn PDF document text
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/luxijojor_zavesugeti_nasupoxunuwuzeg_wekoxoligemelar.pdfIn PDF document text
    • https://zigetavut.weebly.com/uploads/1/3/0/8/130814179/dewapinofexaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fdb27dec3488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477164/normal_5fe8a0ae12ad6.pdfIn PDF document text
    • https://xosizinunebazen.weebly.com/uploads/1/3/4/0/134017923/paxozedesuwagad.pdfIn PDF document text
    • https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/3556852.pdfIn PDF document text
    • https://xumexutibivuw.weebly.com/uploads/1/3/2/6/132680998/6daa5e79.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4463262/normal_60b0716675893.pdfIn PDF document text
    • https://pudogujapoveg.weebly.com/uploads/1/3/6/0/136090910/jubugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7658d35-1d5a-4128-87aa-dd1d4df5e0bd/taxelutebazobututuzuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30d5b7ba-41bb-49b5-a721-f1759c682365/more_practice_solving_for_angles_in_triangles_worksheet_answers.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/24667250159.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd51688-0582-4a09-8c47-8b8c7b520f70/how_much_money_is_roy_orbison_jr._worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ebe7bd-fbef-42f6-b946-a4f78a8c1294/wevotafuzovowulosakolik.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/loxojodovejulolobuwemod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211314a2-a53a-4128-9f1d-0d903ffa5115/dunkin_donuts_iced_pumpkin_spice_latte_calories.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/discord_nitro_hack_android.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/w/file/fetch/144558363/pcsx2_0.9.8_download_with_bios_and_plugins.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9E 6852 bytes
SHA-256: 7a806703289a45174824d983b3f87c370e86a661b4d0e12d5d835fb010394cb8
font_01_sfnt_off00015b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B95 6300 bytes
SHA-256: f7c883e8b9e5d0015a7c0741c2b7b5c6ab478102a670a9509d6f4d71f7f40287
font_02_sfnt_off00017150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17150 5928 bytes
SHA-256: 1d0afcffd6b1125b0699c054d16d560d65e8f7cf3eafbef6be2173d2fea5d7ef
font_03_sfnt_off0001858a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1858A 19068 bytes
SHA-256: d392b140743e34028adcca558faa284d63212ee2aae60fd9cbe6e0d980fa86f1
font_04_sfnt_off0001bfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFD8 18328 bytes
SHA-256: fd3f992231f6c1b8550ded82c79306386916023742f2bf89a35fa7a0ce4e1a75
font_05_sfnt_off0001dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD1A 6172 bytes
SHA-256: 7418b2987b9d5d427173bff92886886840500f0f90bc58591e6d4aa8af559add