Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a036cc41539b54e…

MALICIOUS

PDF

71.9 KB Created: 2021-03-01 03:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a2b7f8828eeb93b1ec520fc73e28abb6 SHA-1: 9ef3de4bf7b17bf9044311cc2acd3591d252ea33 SHA-256: 1a036cc41539b54e354431fc6436f997bc47427507dafa48260a12138f1d7aee
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-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://xezojetit.ru/123?utm_term=official+gre+verbal+reasoning+practice+questions+-+ets PDF link annotation
    • http://regvoolkim.website/malayalam_novels_to_read898ut.pdfIn PDF document text
    • http://megalit-korolev.ru/ridoditatepoweruguwinupaopvqx.pdfIn PDF document text
    • http://flathead.us/sowadujovolefuvarula5md.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_60297d8118358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393181/normal_6000409a11b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_5fe610256bc53.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/ggeShgZ/bufetiz.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/fitazotetojob.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/RhbCihM/lego_duplo_town_world_animals.pdfIn PDF document text
    • http://stebsmeh.space/fipuxoxoke3488o.pdfIn PDF document text
    • http://reduslimitaly.website/all_over_t_shirt_templatef1f1z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366336/normal_5febbf7f6e10f.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/wewuxuviwar/venojuwekalujavuxaluma.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/cheque_leaves_request_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/10147067791.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 5568 bytes
SHA-256: a3a8d700499fbcf044333c8a52d8b3136c2ec6ebec28162d7de1ba717e7c628f
font_01_sfnt_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 11020 bytes
SHA-256: 452f8823c7aa3e68ec16900462907ad46178182756dcf61b724a1a2a947de71f

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