Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6b0b6e6e8e3f7b…

MALICIOUS

PDF

74.8 KB Created: 2021-03-26 12:34:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9eb6c360aff54b06a02b7a06b0f4e6f0 SHA-1: 5e7310aa680328269f360340137aff4368f865e2 SHA-256: 1d6b0b6e6e8e3f7b6b1ad4c561d89fdff60ef04a49baddbe2e0c9360c8945ddf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=chemistry+past+papers+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5ff367d88bb79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490528/normal_6052e9d0c7dba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383695/normal_5fdd461c2808b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485005/normal_602a33ec2ff0e.pdfIn PDF document text
    • http://tryraisins.pro/chicco_keyfit_30_can_be_used_without_base2omgo.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/ihadjdR/71018347351.pdfIn PDF document text
    • http://reactivaperu-2020.com/are_beats_solo_pro_goodxlrrz.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/Zhfihjh/browser_pro_apk_2019.pdfIn PDF document text
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/mufopi.pdfIn PDF document text
    • https://jekodijup.weebly.com/uploads/1/3/4/4/134490718/5543245.pdfIn PDF document text
    • http://microdigitalmeter.xyz/what_types_of_relationships_do_prepositions_showawqo9.pdfIn PDF document text
    • http://getyourscore.info/bhaiya_dooj_ki_video6yuml.pdfIn PDF document text
    • https://cdn.sqhk.co/latosagax/dLiahaQ/hot_wheels_race_off_game_download_apk.pdfIn PDF document text
    • http://timecodes.net/9153364452tf0qj.pdfIn PDF document text
    • http://madamzero.com/enriques_journey_book_online_free7psz6.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/rupozez-barolegu-wapadoke.pdfIn PDF document text
    • http://creditscorerepair.info/exercises_in_style_raymond_queneauct6up.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/9cd3e2e2-f8b2-474d-9676-03e0deb4e147/ginamomilakamovoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/046ee7ff-4694-4312-b28b-4b98c9cb7b0c/the_fallen_series_kristina_douglas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 5256 bytes
SHA-256: 74a2f3ae304f1ebd165a2a643ffcbed101dc1920b90c3de87a1c6e69f8b8b3d3
font_01_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 12196 bytes
SHA-256: ac02c73c726ff656dc026012e1ba9ca6ea2fd3d5d83297faabba446dc2da86a1

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