Malicious PDF — malware analysis report

Static analysis result for SHA-256 161cef31ff3299e1…

MALICIOUS

PDF

69.8 KB Created: 2021-02-13 07:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b5cbf897b75b362be12d974566813c39 SHA-1: 6bb6434cfc2a66ec2132cfd4615b90cd7936eeb2 SHA-256: 161cef31ff3299e1bef02e3268821fd7368becf13c1985a31fbed33354f6e497
146 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of external URIs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a callback phishing or tech-support scam attempt. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into initiating contact with the adversary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=la+crosse+county+land+tax+records PDF link annotation
    • http://sijowusim.22web.org/xewekebonilosujagixaxera.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/javiajb/the_crossing_denver_co.pdfIn PDF document text
    • https://cdn.sqhk.co/buzunonoj/eiahdiG/xefibimupixa.pdfIn PDF document text
    • https://cdn.sqhk.co/tanemurad/IPiakgi/disney_heroes_battle_mode_game.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/6220322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451760/normal_601e002bbf5ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_60225d5c18ef2.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/1759119.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/fisigozugako4v43d.pdfIn PDF document text
    • http://natur-green.fun/sea_container_log_sheet3tw7i.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/bce24c15779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_6021949d090f4.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/zemunomipazikez/animoto_video_maker_for_pc_free.pdfIn PDF document text
    • http://popirarubinuluk.rf.gd/metastatic_melanoma_treatment_guidelines.pdfIn PDF document text
    • http://rejinivak.rf.gd/10082544505.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/zygote_android_cpu.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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 5044 bytes
SHA-256: 22fb6055d81ec55968768a68f795215d33de32f5574b44a9e6d6314b3cef627d
font_01_sfnt_off0000e65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 10476 bytes
SHA-256: 778fa2bf1cee802f21d864e633eda0bb773a5b7bb7f15c5e658eeb71e60d2da3

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