Malicious PDF — malware analysis report

Static analysis result for SHA-256 c011db1e374cbbdc…

MALICIOUS

PDF

76.9 KB Created: 2020-12-18 10:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 5d26beb42483c640bf936e8557bd5f7e SHA-1: 0a8bf3f2bf764c087407f4538db0e2da5f08be95 SHA-256: c011db1e374cbbdcd22ce4e769846e4c790f7b2c7a8d39ab4b6145ef383ba0a5
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a significant number of embedded links pointing to external PDF files hosted on various disposable domains, indicating a link farm or redirection strategy. The presence of a link to known malicious redirector infrastructure further supports a malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate maliciousness.

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
  • 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.
  • 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=nighthawk+carbon+monoxide+manual In PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/d4666c.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/9942221.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/9390028.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/40b808dd9b7.pdfIn PDF document text
    • https://xawiwewediwo.weebly.com/uploads/1/3/4/0/134017039/d156f.pdfIn PDF document text
    • https://roderisagewap.weebly.com/uploads/1/3/4/5/134507489/kofokazuvedar.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/223785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5faacba003296.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/6990108.pdfIn PDF document text
    • https://vuxofuta.weebly.com/uploads/1/3/4/2/134235669/b0bd948d4.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/da2da158-8f93-443c-a0f0-9d64a1639d92/81842809206.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/bayes_and_empirical_bayes_methods_for_data_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/dutojuxifofedax.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_off0000ed82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED82 5508 bytes
SHA-256: 57dc8e4021c5098abdc1bfd91cc06cb61cd0be15886814f0fab9c4673e8abd32
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 11800 bytes
SHA-256: 0bc9eff138a51e4107b2015a8879e829f97dbe572eb1956456a75b96f49b478d

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