Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f819d2d0e4928c…

MALICIOUS

PDF

45.1 KB Created: 2020-03-25 02:23:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f5affb77fe7d4ccfcc0277acdd5446b1 SHA-1: 4d73a3be1feeea4d9628cde81ca3a6fda2f5c5ed SHA-256: 82f819d2d0e4928c35e4633ce4e6e21a62964939e85af13b5513617dd9e3e435
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on numerous domains, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous external URLs are indicative of a malicious intent, possibly to manipulate search engine results or serve further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://sendnit.com/uploads/1/3/0/4/130489830/130489830.html#bible+devotions+for+new+moms
    • http://adentanewzealand.com/uploads/1/3/0/2/130289430/9be817d7.pdf
    • http://nextcuf.com/uploads/1/3/0/6/130605161/36ef4dfaf653426.pdf
    • http://padmasitaa.online/uploads/1/3/0/7/130739456/a1bea9a7.pdf
    • http://www.atrainspeed.com/uploads/1/3/0/6/130605122/sozodufajuzikurum.pdf
    • http://councillorjanetcampbell.com/uploads/1/3/0/7/130739745/xerakopameratu.pdf
    • http://mayday-press.net/uploads/1/3/0/6/130620689/660909.pdf
    • http://cherryhillcrafts.ca/uploads/1/3/0/4/130477309/5389634.pdf
    • http://hope2daycleaningservice.com/uploads/1/3/0/2/130289218/8045318.pdf
    • http://allenvirtueeducation.com/uploads/1/3/0/8/130874060/4414692.pdf
    • http://daredogs.com/uploads/1/3/0/3/130323390/tijopus.pdf
    • http://divorcelawbakersfield.com/uploads/1/3/0/6/130603858/14990.pdf
    • http://mitchellgribbroek.com/uploads/1/3/0/7/130776841/6817595.pdf
    • http://www.exclusiveboutique.shop/uploads/1/3/0/2/130272474/momize.pdf
    • http://eilermannfamilyvideos.com/uploads/1/3/0/3/130323207/wirewes-nugalijag.pdf
    • http://www.development.friendsofadvantage.org/uploads/1/3/0/4/130489122/munukifoj.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_off000083e8.bin
add75888e584fb77c78aee729f8cf52163a9c8043e92af3e12d6985e6c0c4f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 9320 bytes

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