Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ad4f54c29e1cc3…

MALICIOUS

PDF

96.6 KB Created: 2020-12-30 13:05:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dd736c20ed999e4db21930016c971b98 SHA-1: d86c5ee4de91fdbc5d294c99265178bd0e1363b1 SHA-256: a3ad4f54c29e1cc316f5a12fd8f34c1a39714dec09f11079922a8bfa299c8bd8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a mass external PDF link farm, with one primary URL pointing to a search result for a local business, likely a lure. The PDF structure itself is also suspicious, with duplicate object definitions, suggesting obfuscation or malformed content.

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
  • 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.
  • 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://trafficel.ru/strik?utm_term=domino%2527+s+pizza+challenger+ave+roanoke+va PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5feb0811b24c7.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/b6e1e9d.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/7971375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482625/normal_5fb5c61d8e1f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478402/normal_5faa0d20325ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451549/normal_5fb4fcdc6090c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425784/normal_5fe06d978af64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fc732070cff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403808/normal_5fbc060c1ffbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422918/normal_5fa5d7c2d5ac6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f908b66c2c62.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/213437e6-d748-487f-8849-3ae8988cd26f/golden_carp_bless_me_ultima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67c521b-588b-47e4-a34a-c096c509f58e/spin_the_black_circle.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_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 4160 bytes
SHA-256: 1ef2935e8b2f1561be18b50409ae8dca8be58883050da022851e4ab18c5b2bcb
font_01_sfnt_off00013970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13970 5552 bytes
SHA-256: e2a8b4c4e05ca976689afae4702e0d6464aa1593b5c7349dee2ff2aeb4937ef8
font_02_sfnt_off00014c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4C 12048 bytes
SHA-256: ba4ab93598891e239ddf95fee6aea301eebad179bc127c1638276c8cf3d5f5f0

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