Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b59631c68f71ae…

MALICIOUS

PDF

50.4 KB Created: 2020-04-12 21:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 373f0ab18d95dfadacd55301f006fd42 SHA-1: 085189a99cbe2a9d6c2629479d0807de8e294d07 SHA-256: a9b59631c68f71ae1d782faeb284313590bccd6891db53c0ed1bbe8d4676ac03
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are hosted on suspicious domains and appear to be part of a link farm designed to distribute malicious content. The document body, though partially corrupted, contains text suggesting a lure related to file conversion, which aligns with the presence of these external links. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://8128.work/uploads/1/3/0/7/130738831/130738831.html#convert+corel+file+into+jpg
    • http://myopsconsulting.com/uploads/1/3/1/4/131406558/4f7ab0ceb7cf.pdf
    • http://jacobellefarm.com/uploads/1/3/0/3/130313610/5600.pdf
    • http://alembicguild.info/uploads/1/3/1/6/131606231/tikod-zukodenusafenu.pdf
    • http://bulletproofsalesinc.com/uploads/1/3/0/5/130546486/2d550.pdf
    • http://laochassociates.net/uploads/1/3/1/3/131382630/gogewazowaw.pdf
    • http://happyhealthystatus.com/uploads/1/3/0/5/130540823/001630fcdfc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008606.bin
b0fdd6571a4c42af9604b2d01f2566085cbd7aa931eacbcc415dd291bb9b1ba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8606 9252 bytes
font_01_sfnt_off0000a8e1.bin
a68ad206e6fa00de9a93bcd426264e2a948f22db9431d90be7110a1ae082cbf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E1 16076 bytes

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