Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2836f71f1bfb45f…

MALICIOUS

PDF

72.0 KB Created: 2020-11-22 23:55:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8e706ca9f9fd54e0f3a37bdce4dd75 SHA-1: b187fa96cffb250442315a2f2a494eb5ab7c80c1 SHA-256: b2836f71f1bfb45f7ae98fd62be2413306c3e6d444db5e6fb36ac3495e52d582
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggests a phishing or spamming attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a phone number, a common tactic in tech support scams or phishing campaigns. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=exerpeutic+100xl+manual+treadmill
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f86f57d02f2a.pdf
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f88d98151513.pdf
    • https://cdn-cms.f-static.net/uploads/4407057/normal_5fa43b0f094f7.pdf
    • https://lufugidot.weebly.com/uploads/1/3/4/8/134848642/ead35936b.pdf
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/eb472abe.pdf
    • https://lavuzolitad.weebly.com/uploads/1/3/4/3/134327879/9937263.pdf
    • https://cdn-cms.f-static.net/uploads/4448980/normal_5fa390d63d6f1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/tixedujegibex/42344780978.pdf
    • https://s3.amazonaws.com/mukutud/wallpaper_hd_girly.pdf
    • https://uploads.strikinglycdn.com/files/53a61048-eb40-4b54-80c2-99c4d6cac2e9/movimiento_muralista_mexicano.pdf
    • https://s3.amazonaws.com/henghuili-files/25558984758.pdf
    • https://s3.amazonaws.com/jeponowon/xesabasoditiberetokekaka.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce6d.bin
2425ff8b8776fe20ab1b02a3eeb8cdb95754e53b2f612866c0b9949897822f23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 5032 bytes
font_01_sfnt_off0000df6e.bin
ca033fff3b28887849972d0abda551ccc7dc5cd131df66ecb6140c0fb9e2412f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 11112 bytes
font_02_sfnt_off0001051e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 4324 bytes

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