Malicious PDF — malware analysis report

Static analysis result for SHA-256 4308ddcac0b348f9…

MALICIOUS

PDF

75.6 KB Created: 2021-02-08 17:38:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7545725704891a18efdce0cd14735b41 SHA-1: 0c048f2a36b27dd7c6f73df0a4c0a0b6221c3cb6 SHA-256: 4308ddcac0b348f9ab1d41b9f6a148c5deefae9e24a788b7bee4f1cf94d48a8f
126 Risk Score

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://jacksth.ru/aws?utm_term=drum+sheet+music+tutorial PDF link annotation
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/sexowubozosipag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391047/normal_5fe6458c8d0ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465390/normal_5fd669f90e325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414353/normal_5fdccd91901e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5fd68aad6bd62.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/padozejoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413374/normal_6017f6eda9f3c.pdfIn PDF document text
    • http://eglo.club/zibalenupijewodizustg3jc.pdfIn PDF document text
    • https://jejuzuvavat.weebly.com/uploads/1/3/5/3/135384919/dutap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486763/normal_5fd1eb86c6c3c.pdfIn PDF document text
    • http://modernstyle.pro/my_grammar_lab_advanced_c1_c2_answersw1f6k.pdfIn PDF document text
    • http://meine-gebuhrenfrei.com/cgi_vfx_freehwwde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5fe11c69c772c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_601d670ce3625.pdfIn PDF document text
    • https://jedawakebikota.weebly.com/uploads/1/3/4/7/134715316/vibotapuvu.pdfIn PDF document text
    • http://thiswaytovogue.com/my_garden_answersi5ily.pdfIn PDF document text
    • http://grampus-shop.com/zodaxeanj6w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 5036 bytes
SHA-256: 6387f6f074888abb96d57f2e4dd97aca2662ea4d5a09434a2b75059653ad2472
font_01_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 10488 bytes
SHA-256: ee588f2f651a18813e0f3af410ed441f218445dcacecd90e9da54678e77215ff