Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7020872a9d46f4e…

MALICIOUS

PDF

81.6 KB Created: 2021-06-07 01:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d49ca96b7e152ba59ade53f6ab253f7b SHA-1: 7463b7c48f41b8f04b1577935a2369acd2780c67 SHA-256: c7020872a9d46f4ea22c078e171bded1d5b79b5cfd39d65d1ff75b4038795da1
186 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. 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 0.9950

Heuristics 6

  • 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.
  • 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://huntic.ru/pbw?utm_term=recargar+diamantes+free+fire+por+id+gratis+2020 PDF link annotation
    • https://fixaporaxaju.weebly.com/uploads/1/3/1/4/131413905/9235259.pdfIn PDF document text
    • https://kifowufowuvix.weebly.com/uploads/1/3/5/3/135392599/timutanepewazuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469617/normal_60053c58e61d4.pdfIn PDF document text
    • https://jowovodepavilim.weebly.com/uploads/1/3/4/6/134651336/kajeru.pdfIn PDF document text
    • https://fojanatixisi.weebly.com/uploads/1/3/4/2/134265346/4518013.pdfIn PDF document text
    • https://mizemetugez.weebly.com/uploads/1/3/4/3/134322353/vugasez.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/togagotisagerikiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419637/normal_6019642996d0a.pdfIn PDF document text
    • https://kitupiver.weebly.com/uploads/1/3/4/4/134446404/vegudu.pdfIn PDF document text
    • https://takotowi.weebly.com/uploads/1/3/4/3/134356266/4446358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd170c12955e.pdfIn PDF document text
    • https://kezikiwagoxarud.weebly.com/uploads/1/3/0/7/130739267/zafodokava.pdfIn PDF document text
    • https://regegabup.weebly.com/uploads/1/3/4/0/134040411/5536240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455876/normal_5fd79b8366513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_60342c31d0392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144618885/84181310328.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/f/63209948972.pdfIn PDF document text
    • http://lukipuj.pbworks.com/f/6521462650.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/f/hamilton_beach_flexbrew_2-way_coffee_maker_owners_manual.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/49937975483.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/volobovaxa.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/92778522277.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144556707/envision_math_grade_6_answer_key.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/f/non_chronological_report_introduction_examples_ks2.pdfIn PDF document text
    • http://rumusapage.pbworks.com/f/23322829129.pdfIn PDF document text
    • http://rupebaxo.pbworks.com/w/file/fetch/144598746/mosbys_paramedic_textbook_4th_edition.pdfIn PDF document text
    • http://bavudexote.pbworks.com/w/file/fetch/144751557/70893817334.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 5724 bytes
SHA-256: 81146aa4c803a870d41c75c8fc0e6f0b0de3b5b6f08d9924af007d99147c1c95
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 11928 bytes
SHA-256: 1e5bed8886dc7ebc00092979a3ec3b004d9f11b49aa6f01af2687278446f5469
font_02_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd