Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d95be804caa19a…

MALICIOUS

PDF

75.5 KB Created: 2021-05-17 10:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c192204a19713fc1ba09a64ba6e09ee SHA-1: a51978e72110aebdaac40bc7c8019b366c6cebb5 SHA-256: 75d95be804caa19a5ac16b09e853cee7230f5b8359be19e7e706c88d8653e152
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains a title related to 'Los hijos de sanchez' and references wkhtmltopdf, suggesting it's a crafted document. Numerous embedded URLs were extracted, with several pointing to disposable hosting domains, indicating a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=los+hijos+de+sanchez+resumen+por+partes
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • https://static.s123-cdn-static.com/uploads/4469631/normal_5ff7e2d80d6ed.pdf
    • https://cdn-cms.f-static.net/uploads/4480161/normal_601d21329b29e.pdf
    • https://cdn-cms.f-static.net/uploads/4482870/normal_60170951503e5.pdf
    • https://cdn.sqhk.co/jogujufuza/jNjahbj/barbie_princess_spa_salon_makeover_games.pdf
    • https://static.s123-cdn-static.com/uploads/4425933/normal_6007f45bce8eb.pdf
    • https://cdn-cms.f-static.net/uploads/4412382/normal_6011e78a4b922.pdf
    • https://cdn-cms.f-static.net/uploads/4385417/normal_5fea1e4ae27d9.pdf
    • https://cdn.sqhk.co/pogadidotilu/cha2ge9/tezonujan.pdf
    • http://nuxavifolezew.22web.org/beowulf_liuzza.pdf
    • https://cdn.sqhk.co/wazikunal/igWhhjg/xalotuxaka.pdf
    • https://cdn-cms.f-static.net/uploads/4366014/normal_6040230c0de3b.pdf
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdf
    • http://trendmobile.ru/how_to_say_the_rosary_prayersmwhek.pdf
    • http://trysalon.xyz/79360293813wbo7w.pdf
    • https://static.s123-cdn-static.com/uploads/4417534/normal_5fcecdff4664f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mejadub.epizy.com/warhammer_40k_9th_ed_release_date.pdf
    • https://s3.amazonaws.com/bopuxosavubare/does_davids_bridal_rent_tuxedos.pdf
    • https://s3.amazonaws.com/ziwuvijevo/animation_creation_software.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/ruzeku.pdf
    • https://s3.amazonaws.com/tokatefozude/rental_house_contract_template_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e971.bin
fe5b7d9fe039352822cab16a3174540824ce807bd5673def58acd0d4fa26ae3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 5348 bytes
font_01_sfnt_off0000fb87.bin
aec77f9f50bf86e23b1c8a563a159e5b4a79b66eca883a92c1611c1f28992865		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 11124 bytes

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