Malicious PDF — malware analysis report

Static analysis result for SHA-256 323562f79aa6c330…

MALICIOUS

PDF

86.5 KB Created: 2020-04-14 13:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e419d6278b55ac4e08b87a780d9cd6a9 SHA-1: c6a3a495225bcd8acaba0e68027b14665c482aa2 SHA-256: 323562f79aa6c3306b73f6e97f8586a24844f8bd39d582ffd1c5a43cc500a1cb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous external links, identified as a PDF URI and part of a link farm, suggesting a tactic to drive traffic to potentially malicious websites. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the presence of many embedded URLs points towards a content-driven lure, likely for SEO spam or to distribute further payloads.

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://robertshrigleywoolf.com/uploads/1/3/1/3/131383575/131383575.html#beaverkill+fishing+reports
    • http://stresslesscollege.com/uploads/1/3/0/6/130620931/168024.pdf
    • http://prettynpink18.com/uploads/1/3/0/2/130287939/kupas.pdf
    • http://biurorachunkowe-krystynalenczowska.pl/uploads/1/3/0/6/130604568/782f79265ea5d53.pdf
    • http://hornblowertours.com/uploads/1/3/1/3/131384373/nafimuvelox-bunipeses-gukixel-zafadu.pdf
    • http://colin-barrett.com/uploads/1/3/1/4/131407353/94d7218.pdf
    • http://kristabell.net/uploads/1/3/0/8/130813787/6846986.pdf
    • http://celebrateloveliceremony.com/uploads/1/3/0/5/130589230/b03fbeb.pdf
    • http://customsystempro.com/uploads/1/3/0/4/130476221/vajavafivolirabu.pdf
    • http://gcharlieplumbing.com/uploads/1/3/0/4/130436020/xafanemexezew.pdf
    • http://moliciousbbq.com/uploads/1/3/0/6/130621108/5052638.pdf
    • http://potatopants.org/uploads/1/3/1/3/131398004/leniz-kurugereso-peleto-jobinedageta.pdf
    • http://reliableiptvstreams.com/uploads/1/3/0/5/130588653/7b69a6be15aa.pdf
    • http://salazarcooklaw.com/uploads/1/3/0/3/130313346/jikutes.pdf
    • http://painshift.com/uploads/1/3/0/6/130621570/gatusitefelonexap.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_off00012c9a.bin
25380a87694e939605f600a9ca415759fdc4c2b75e56a9f744273be08bab2f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 8644 bytes

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