Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b274f502063144…

MALICIOUS

PDF

62.7 KB Created: 2020-12-20 21:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e3061a84f2e456870d0e22f5bed0e0c7 SHA-1: bb0bbeb3eb08bd925019f2db473a3cb6f7aaf20f SHA-256: 04b274f50206314452bbfdba368c3729e93ca0c1dd26934f21b2af33f16e61a4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs and the PDF structure indicate a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious classification.

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
  • 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 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.
  • 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://cctraff.ru/strik?utm_term=tamilserials.tv+ini+ellam+vasanthame In PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/01b1589d5.pdfIn PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/majusukusidosej.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/84683d2356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5fbcc7b193377.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421939/normal_5f9c6208ca1e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5fbf1a5c71037.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/sedejepexadup-nepavijenewas.pdfIn PDF document text
    • https://tewifevorifoja.weebly.com/uploads/1/3/4/3/134387655/sepatogoxinigu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_5f98124d3d3b1.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/nisiwanolom/android_biometricprompt_face_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26b6152b-9f10-4ee5-92a3-9c769b19de38/pavowixejegewas.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/61185083614.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_off0000bc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3D 4968 bytes
SHA-256: e9a953b9b993d56f492ce882f638e568c2bee70f21428b8aedca4cba7b745940
font_01_sfnt_off0000ccfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFC 9984 bytes
SHA-256: 817c59126abf4edbb6d466ba2c774ed59c4449cbb3b023dfe87519ce95cefdd5

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