Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9bb029282e46c2…

MALICIOUS

PDF

33.8 KB Created: 2020-04-09 06:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 5b35a59a64ee9d5d8a95574aa4cca318 SHA-1: 3a5389f4c696481fd0c9db5d090b6dfe61add691 SHA-256: 5b9bb029282e46c26cbdff430f75b59ecf33b0cb15ddd7d17bf16563a477106c
116 Risk Score

Malware Insights

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

The PDF contains numerous external links to other PDF files, a technique often used for SEO manipulation or to host further malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern, and the ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the document body contains obfuscated text and URLs that are consistent with a phishing or scam attempt, likely aiming to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 http://candyvorecreative.net/uploads/1/3/0/5/130540746/130540746.html#02043+area+code+uk
    • http://minimocs.com/uploads/1/3/1/0/131070147/230104.pdf
    • http://legacyremodeling.net/uploads/1/3/0/6/130639791/javofifil.pdf
    • http://ytsphotography.com/uploads/1/3/0/6/130639915/5061820.pdf
    • http://corazonz.com/uploads/1/3/0/7/130775429/datese.pdf
    • http://hcranfordsclassweebley.com/uploads/1/3/1/4/131437313/zuvuwoverefikeregu.pdf
    • http://buff2shine.com/uploads/1/3/0/6/130603749/jewepasakugi.pdf
    • http://goldballrally.com/uploads/1/3/0/7/130740536/filewal.pdf
    • http://lsbrpc.net/uploads/1/3/0/6/130604767/34d489ac6bc7.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c71.bin
cbe781eec57e6d9a6d8a3b20e840109e5e233e911791d70008f5e45e74f7bd77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C71 7792 bytes

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