Malicious PDF — malware analysis report

Static analysis result for SHA-256 88519fb13f2a42c7…

MALICIOUS

PDF

66.1 KB Created: 2021-01-07 21:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a0d75c9a1d18346e4ace078da5dc3135 SHA-1: 7bd63fb427e0325e0ea98305fe337786a0eda35f SHA-256: 88519fb13f2a42c7fc616d11ee828f644a739a202a236e90fc288cd605c123ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The embedded URLs point to various PDF files hosted on external services, indicating a potential attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffe.ru/123?utm_term=ikea+clothes+rack PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5f9a3c2f1579c.pdfIn PDF document text
    • https://varovofuzurido.weebly.com/uploads/1/3/4/5/134598094/d6d2f049f8b4f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f8f3e94b064d.pdfIn PDF document text
    • https://lakiromepokina.weebly.com/uploads/1/3/4/5/134589127/0c129a.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/9jgdhji/strikers_1999_mod_apk_2._0._20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5f8754ef03d0a.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/2y66Hhj/rulitinosodaleboxitobab.pdfIn PDF document text
    • https://cdn.sqhk.co/xewumoxu/gjiieia/phone_ringtone_rock_music_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5faac2989e205.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/8jjjgjl/school_edition_think_think_gif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387825/normal_5fcc654a7c7ca.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/najipavez/27127006506.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_off0000c91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 4888 bytes
SHA-256: ff371bfd4abf5a94bbe6aef4efef0da5daa84f46d4ac58d91f6341b9ab010b54
font_01_sfnt_off0000d9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AD 10204 bytes
SHA-256: 67c6b9fbec8c56c2dcc322b8543020b0000eb4ac8718c890a47436bc6009fb4e

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