Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca80e9c6854ce7cd…

MALICIOUS

PDF

82.1 KB Created: 2020-12-25 04:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: dcaf043b0751957012736992470b9f4b SHA-1: 2bb6bb14514704efa1c93eae01df5b6037fd3118 SHA-256: ca80e9c6854ce7cdf25dde199b986118a617c556b987d53976feaa1cad1f3083
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable or link farm infrastructure. One critical heuristic indicates the PDF links to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffmen.ru/123?utm_term=carbon+fiber+license+plate+frame+audi In PDF document text
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/7716274.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/tolulis_sevufaki.pdfIn PDF document text
    • https://doxigexuwalo.weebly.com/uploads/1/3/4/7/134708718/08ee2cc8b35.pdfIn PDF document text
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/c89894c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fd7bb607b6ce.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/gakigeba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380226/normal_5fde2de25e4a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405184/normal_5fa08054d0055.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/6b26500b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479715/normal_5fb5b1028a8fc.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/1672160c71976.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416929/normal_5fa555167d068.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/tirimofufemukat/vagadebas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914701c3-d0cc-4e69-9f1e-397f91b70c5e/vezuvalusimaru.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/ser_bachiller_2018_junio.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AB 5344 bytes
SHA-256: 4afdadb4cd348bbcf09d5dd99d37e2cf3597cd38902add94ca7c672c90c723aa
font_01_sfnt_off000113bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 11188 bytes
SHA-256: bb4acad908f727d6ffc6df9a7321c9d33aa7c4bccddef291cc7ec3d594687065

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