Malicious PDF — malware analysis report

Static analysis result for SHA-256 562a31f61104b359…

MALICIOUS

PDF

77.4 KB Created: 2021-02-22 20:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: b99bb497a26c6ae285be3a6a3eea3c34 SHA-1: 6b7c4d1f667ca4d29fe5c268ead505af9792e8be SHA-256: 562a31f61104b359866af83d2bba8a415df3d26de450ccb826c8713d988afa88
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with a primary suspicious URL pointing to 'bologen.ru'. Heuristics indicate it's a link farm on disposable hosting, and a ML classifier and ClamAV both flagged it as malicious. The document body, though heavily obfuscated, contains keywords related to '2020 nc ez tax form', suggesting a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=2020+nc+ez+tax+form PDF link annotation
    • https://cdn.sqhk.co/lonubugogere/Qhiehjn/live_photo_wallpapers_among_us.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/yFji3ue/pikabu.pdfIn PDF document text
    • http://vipodesin.22web.org/tunowulavotisekos.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/hgjbyIo/disney_dumbo_read_along_storybook_and_cd.pdfIn PDF document text
    • https://cdn.sqhk.co/pulununese/YhbJZpw/smart_wifi_switch_for_garage_door_opener.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390681/normal_5ff0d1f54a09a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465702/normal_5ffd86ab02986.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/iNWrhd9/32979856040.pdfIn PDF document text
    • http://all-gopro.com/blanchard_macroeconomics_7th_edition_freeiqray.pdfIn PDF document text
    • http://bestunew.xyz/bengali_alphabets_with_english_translationjdozv.pdfIn PDF document text
    • http://trickyturkey.com/tuzonulonu2jiq.pdfIn PDF document text
    • http://feldhaus-klinker-plitka.ru/cajun_injector_electric_smoker_xl_manuallajuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/defaju.pdfIn PDF document text
    • http://xopozajuve.epizy.com/whatsapp_fm_latest_version_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/sekafovadi.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/rikalalalazi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 5116 bytes
SHA-256: 8c418ddbbde132df048a5e8aba2c45cf67237aecdafd797c3a4d266404de5531
font_01_sfnt_off000104e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E1 10592 bytes
SHA-256: 5403913d6d891a9409281cc0d60429b5bce87a6e2e8feeba12c906b62e0059b1

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