Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5ee7280ccd3a20…

MALICIOUS

PDF

92.7 KB Created: 2021-03-16 09:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b857563cefd7ac68c2990a55173f2ce7 SHA-1: 6e8cb4ddbd1046198cb511779644e4d755a84332 SHA-256: 7d5ee7280ccd3a20e7c8fb460b3b873ea0e757e1eb350dd019007498f2bac144
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9396

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://druttle.ru/award?keyword=autosomal+dominant+vs+autosomal+recessive+pdf PDF link annotation
    • https://cdn.sqhk.co/mezutorixo/ghfGhcX/e-_wallet_meaning_in_computer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_603be391ef201.pdfIn PDF document text
    • http://ig-copyrightviolation.com/schwinn_joyrider_double_bicycle_trailer_partsasr9o.pdfIn PDF document text
    • http://cyberlife.store/22569077886fz482.pdfIn PDF document text
    • https://cdn.sqhk.co/demejapad/e5ZdjfL/syberia_3_review_ign.pdfIn PDF document text
    • http://openlait.pro/jafototizusixoqmwqq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477864/normal_5fcbd95f70d57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_5fdb6657ce277.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/jdyJva7/20174353743.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409409/normal_600174204118a.pdfIn PDF document text
    • http://garant-ritual.online/sims_3_apocalypse_ccwzqgm.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/iYDjgja/download_game_speedway_masters_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_5fe5e6ada9cff.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/ETbLvjh/zikowijat.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/xopugup/kekinimimozipubolimiguzu.pdfIn PDF document text
    • http://fokafupu.rf.gd/cpm_core_connections_algebra_2_answers.pdfIn PDF document text
    • http://vaxesopubowutuf.rf.gd/bepodudiwot.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/jagoxepozuw.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/mutolokiparuxol.pdfIn PDF document text
    • http://gofudawaropuz.epizy.com/accurate_weather_app_android_free.pdfIn PDF document text
    • http://virawumeritaxo.rf.gd/9780875974.pdfIn 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_off00013373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13373 5352 bytes
SHA-256: 8fc6a471ec95f3f456c6541d993ac078f40deabb15fcb11ecbfc31ace5da2804
font_01_sfnt_off00014591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14591 12000 bytes
SHA-256: 4f511d43c5937e29d0ea260f9463711df10869a0f473610cf27947b9e0e7dad0