Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b8029c9ea340af…

MALICIOUS

PDF

73.7 KB Created: 2021-03-06 19:34:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d8624758ef2273d47c64e4663beea44e SHA-1: a648d14b577ce76f2e0ce71bf39d08232983fbf1 SHA-256: f5b8029c9ea340afd84bc8c2f16dea9b64b2b8b3551e199f2bdd14d9b40a5c2c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection.

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 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.
  • 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://ponafet.ru/award?keyword=understanding+architecture+robert+mccarter+ebook PDF link annotation
    • https://gugivubur.weebly.com/uploads/1/3/4/3/134390132/bazanujevopagewe.pdfIn PDF document text
    • https://pisukobuvasojab.weebly.com/uploads/1/3/4/3/134398412/zibatubu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371787/normal_5fccbe3c94d2e.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/egcvje6/96485224956.pdfIn PDF document text
    • https://cdn.sqhk.co/watexoba/jg8giia/wind_up_knight_2_3ds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412999/normal_5ff99543e7f58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_60259c51e890c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_5fe75d881bafd.pdfIn PDF document text
    • https://gidapozu.weebly.com/uploads/1/3/1/3/131379371/gasinivarajipevubeni.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/Vgd0gh0/2131684434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_601c6531b15d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416654/normal_5fd8767d9e36b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_602b26f43a251.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b25c5c-8b8f-43f1-a580-4eabb64070ab/nowideg.pdfIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_13ec2d741b464558bffe8d9b28403c6d.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_4c0fb02c439445d88e21d0b451508a88.pdf?index=trueIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_c0836134a1a849a1951a58ef60584a33.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_df31bae5d09a40f39c202945ce664543.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32f7718-5de5-4205-aa41-312dca491c37/delta_planer_model_22-580_parts.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_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 5516 bytes
SHA-256: ccd6a7718f53aeb0280d64774ca1729420d3160ae6b87f0a358bd47d77b1bd9d
font_01_sfnt_off0000f619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF619 10308 bytes
SHA-256: 93bc14af646a944b52345e7729e68fa04ad42cbe4f4f97d4f03408a5efed1eef

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