Malicious PDF — malware analysis report

Static analysis result for SHA-256 578171e2da200642…

MALICIOUS

PDF

41.6 KB Created: 2020-04-21 01:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3156e314a9c889d47535e6c1a81d92b8 SHA-1: 6ebe2fcec34eb5069af1e4bfd7ea8a1aff2d2067 SHA-256: 578171e2da20064251ab7d2b3b9fed17f936a31d2d7e4659b55cd0b5add236b5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. One prominent link points to a UK visa application form, likely a lure to entice users to click. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://momandpopsbbqhq.com/uploads/1/3/0/5/130546076/130546076.html#uk+visa+tier+4+application+form
    • http://foreverfaithful.com/uploads/1/3/0/4/130483515/4022387.pdf
    • http://threeinonedesigns.com/uploads/1/3/0/7/130740089/91352d038f5.pdf
    • http://alternativevaping.com/uploads/1/3/1/4/131453016/nedakafefanize_rezotajatiruj_bitikalupesux.pdf
    • http://lynlish.com/uploads/1/3/0/6/130639363/wujozesa.pdf
    • http://oufootball.us/uploads/1/3/1/3/131398052/pomoxokowuti.pdf
    • http://weariwin.com/uploads/1/3/0/4/130435956/0d96874.pdf
    • http://thelvo.com/uploads/1/3/0/7/130738633/0e0d706ba7e38.pdf
    • http://growersecrets.com/uploads/1/3/0/7/130775633/zefunewazemos.pdf
    • http://myngheer.club/uploads/1/3/0/6/130621871/9e1c3.pdf
    • http://thelvo.com/uploads/
    • 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_off00007b81.bin
f4fef2fe1a65f610157508b752b67c871094a2c481e3e7e6a38c71e1fbec66cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B81 7952 bytes

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