Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd3809bf6c97ebb…

MALICIOUS

PDF

69.1 KB Created: 2020-11-19 15:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 634530e1030093c0d7afe07d41b10ff3 SHA-1: 2e07680cc0a34c9d53f0d3b25b3a9dacb7c8649a SHA-256: 8cd3809bf6c97ebbd5627fd17265c6e4cba2caa8c02e399ba8ed53966d99992a
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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.
  • 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://trafffe.ru/strik?utm_term=blackburn+fluid+trainer+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f86faafc6201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375703/normal_5f9087e510070.pdfIn PDF document text
    • https://gozuvixonoj.weebly.com/uploads/1/3/4/5/134517501/2338828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5f96eed48d9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5f870266ac877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_5f99badbe15c4.pdfIn PDF document text
    • https://jewojumafolu.weebly.com/uploads/1/3/4/6/134651010/2941309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5f923692edd1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f945a3d05823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379974/normal_5fa083abed1e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_5fb5c0d7d80f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d38ec46c-752f-46b6-aa00-e1cc57947fa8/lego_cinderella_castle_celebration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fcfc449-f80b-46a7-a771-72a02a67c4bb/75934316633.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/arc_length_formula_degrees.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC326 5012 bytes
SHA-256: 0e475dd69bc29fddfe3c752c0ac722bda0f8f1eede2ba77681c86dc9f531cf72
font_01_sfnt_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 11112 bytes
SHA-256: af222b9cdeba8f0022bc80661c80d136a6faa3427b86b68e534ef44708c10573
font_02_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

Open this report in the interactive analyzer, or submit your own file for analysis.