Malicious PDF — malware analysis report

Static analysis result for SHA-256 7668b06254023156…

MALICIOUS

PDF

95.1 KB Created: 2021-01-20 04:26:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4370d9f45b2e500ce4fe8e1c192f170b SHA-1: 9bb63f55826d08255d99f54c5a2c07f3da20543e SHA-256: 7668b0625402315644dfdfbb4b6d8e73e850a6f56051e5eaf6abd01b384118cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or link farm services, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it might be a crafted lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=cronica+de+una+muerte+anunciada+personajes+principales+y+sus+caracteristicas PDF link annotation
    • https://cdn.sqhk.co/lidupusumoj/hh7wvge/tomb_raider_movie_sequel_alicia.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/i2jjjd8/zekodaguzudazupow.pdfIn PDF document text
    • https://site-1251922.mozfiles.com/files/1251922/mijowapogavelovemumox.pdfIn PDF document text
    • https://lezanaxowap.weebly.com/uploads/1/3/2/6/132696506/geforulakisetezuw.pdfIn PDF document text
    • https://site-1179637.mozfiles.com/files/1179637/light_and_airy_presets_for_photoshop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387931/normal_6007574c6086a.pdfIn PDF document text
    • https://site-1177591.mozfiles.com/files/1177591/admit_card_link_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/fopalixogul/vgjhgib/50644167435.pdfIn PDF document text
    • https://site-1176192.mozfiles.com/files/1176192/arquitectura_de_computadoras_von_neumann.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/kuzikivajiguk.pdfIn PDF document text
    • https://site-1174105.mozfiles.com/files/1174105/rampage_classic_arcade_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xefijumu/dqbn7jc/83098016723.pdfIn PDF document text
    • https://site-1171591.mozfiles.com/files/1171591/37426202079.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/LjagcWP/12659003191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5f9bab01d48eb.pdfIn PDF document text
    • https://vijekufimukij.weebly.com/uploads/1/3/0/9/130969895/sebesixutim-jidamuluzu.pdfIn PDF document text
    • https://site-1176360.mozfiles.com/files/1176360/fruit_splash_water_images_clip_art.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/game_recorder_windows_10_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_5fbccbcdef172.pdfIn PDF document text
    • https://site-1176192.mozfiles.com/files/1176192/infected_ingrown_hair_inner_thigh.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/nasitevu/vlc_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/florida_dmv_written_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/49264376278.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_off0001363b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363B 5300 bytes
SHA-256: ee92ed3cd5889a9b5b28c46b95d0577b9ffb2d3381e42747a9795ccb2f40809a
font_01_sfnt_off00014833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14833 10796 bytes
SHA-256: af6ad748ee45875aef5e3c80d67ab19528ac7f19d5f7b8eb9ea7b2aff95c7d49

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