Malicious PDF — malware analysis report

Static analysis result for SHA-256 44845f489455af97…

MALICIOUS

PDF

108.3 KB Created: 2020-11-17 15:54:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 49e397fb01e697c9c49100d1b4a1980f SHA-1: e78335ed7500579102e48843e5a54f180617bf88 SHA-256: 44845f489455af97c4efbd70405159f10fdbb33b16d4ca34a2c94e125ec201dd
234 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://traffmen.ru/123?utm_term=elm+creek+ne+to+kearney+ne'. Additionally, it exhibits characteristics of a callback phishing lure, prompting users to call a number in a billing or security context. The presence of numerous embedded links, including a link farm, further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=elm+creek+ne+to+kearney+ne In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377662/normal_5f8f6c54ccde9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f942957efca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5fa32e3c1a554.pdfIn PDF document text
    • https://giboramogu.weebly.com/uploads/1/3/4/6/134627050/zinilimasoxejif-duketoko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371509/normal_5f9855cc093fe.pdfIn PDF document text
    • https://rusokupos.weebly.com/uploads/1/3/4/4/134468665/xiduk.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/kuboki/nt1110_unit_6_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/aj_rossi_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb2fc846-7943-4137-840d-bc0068c68ed9/mechatronics_electronic_control_systems_in_mechanical_and_electrical_engineering_w_bolton.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/gebadodafimu.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/lonimodinebegojibadod.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/5973058819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f08ede-f7ee-4bb2-8b09-56b596a37ba5/86181885046.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_off00015e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4C 4888 bytes
SHA-256: ec071304ef6e49ff0bafd2fdb5c5f92f8ad57da841687343229942f9e304ce33
font_01_sfnt_off00016ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE3 17176 bytes
SHA-256: a991f111bb91f13d15c118917ebef703d915235eb3eb8bdb72f72ef93d70e3a2

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