Malicious PDF — malware analysis report

Static analysis result for SHA-256 90401f62c3e2c577…

MALICIOUS

PDF

95.4 KB Created: 2021-02-13 17:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5284434ac44ef54926daeafe2492bbb0 SHA-1: 080e76a9b534cb238216f364ffc1ccd58ddf5a01 SHA-256: 90401f62c3e2c577a8cb6fab2e8d4ab7031641be06c7c8b7a5228b8ae1bbe20c
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 0.9995

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://kisetizep.weebly.com/uploads/1/3/5/9/135992433/c4a9fe2435b.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://crophysi.ru/wix?keyword=forks+over+knives+cookbook+pdf+download+free PDF link annotation
    • https://cdn.sqhk.co/kisereta/zD0hgnh/43646280870.pdfIn PDF document text
    • https://kisetizep.weebly.com/uploads/1/3/5/9/135992433/c4a9fe2435b.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/fryihj8/54078623574.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/97375514301ouzzc.pdfIn PDF document text
    • http://konobemozitu.iblogger.org/epf_withdrawal_form_aadhar.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/hhljbjb/dovube.pdfIn PDF document text
    • https://xogovowumo.weebly.com/uploads/1/3/0/7/130738979/e1b8388361b4.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/2375809.pdfIn PDF document text
    • http://allostar.buzz/97682159581d5b2q.pdfIn PDF document text
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/nafafofifufi-xolavebimo-sisal.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/qibgdij/celebrity_cruises_logo.pdfIn PDF document text
    • https://ledapenilodaro.weebly.com/uploads/1/3/1/0/131070651/pajosowewejenoduzug.pdfIn PDF document text
    • http://geekcods.com/lexmark_x1150_printer_driver_windows_7zjuj7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/wevevorelamupike.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/dunawowili.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/beyblade_burst_episodes_in_english.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://www.gnu.org/licenses/gpl.htmlIn 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_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 5168 bytes
SHA-256: 08834449f8ca504443dc570478ea8048553517098e3279ccd1d38361e23078ca
font_01_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 5852 bytes
SHA-256: 070190071500e4e782f35bfd755afae89b66324ef3097a980fd68c75fb9893f1
font_02_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 2092 bytes
SHA-256: 6e5de5c6bcb7fdd8c5ca0d25823a8f80e6c764803c1b732dbc9c425a5c0f8ea5
font_03_sfnt_off000121b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 10960 bytes
SHA-256: b8a9fbb36a423fdd18a17f274f29b7e6b9d15bd4088433a4023d766727cae2b0
font_04_sfnt_off0001476d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1476D 17124 bytes
SHA-256: 9aec9cafd02ccafb13f1ea61509baf045fb5abe5de1d82f2e6b56ef63ad543b6
font_05_sfnt_off00015eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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