Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c836c692c946a74…

MALICIOUS

PDF

80.5 KB Created: 2021-03-02 18:46:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 861c468addaf56795454936bd6e42696 SHA-1: 21bcf76f77660aea4a60e8fb59258905c80163ba SHA-256: 3c836c692c946a74b241294306d76556023ca620c88a2ee0b5920c32c5242642
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'baking word power worksheet answer key'. The presence of external URIs and the ML classifier output strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

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://pelibifir.ru/wix?keyword=baking+word+power+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/xubulozirod/gdjbieq/49205694599.pdfIn PDF document text
    • https://nunigagajil.weebly.com/uploads/1/3/4/7/134751499/3109ec5cec22e01.pdfIn PDF document text
    • https://cdn.sqhk.co/rotefuver/hijieXn/redmi_airdots_driver_windows_10.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/53568296367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_603e52a895081.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/aVaggjg/wood_cutting_band_saws_for_sale.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/f312d20172d.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/hb9jgjU/rokenumipol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fd90040ab580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448713/normal_5fffa7552399f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5fc6d8661bb7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393220/normal_5fdf8e4a57ffa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pobevezegudam.epizy.com/arabic_calligraphy_app_apk.pdfIn PDF document text
    • http://duxejuxaxeze.epizy.com/79437127075.pdfIn PDF document text
    • http://pibonev.rf.gd/hero_wars_titan_leveling_guide.pdfIn PDF document text
    • http://xexojonorowo.epizy.com/prison_break_season_3_episode_4.pdfIn PDF document text
    • http://zusatixolapurir.epizy.com/wuwivisogagivuwep.pdfIn PDF document text
    • http://jatomije.rf.gd/abandoned_vehicle_report_nevada.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_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 5284 bytes
SHA-256: ae7d82ca6d10921481da9f0f9d0607ca5579ebd20c2bdbc4f6e1191f8cbd6ed5
font_01_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 13860 bytes
SHA-256: da2e8659e523cfb89e2907395c3a2b2cfd6c8d658ffae7c9d9c1fd85593fcc06
font_02_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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