Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd9d2a14908b0f64…

MALICIOUS

PDF

45.8 KB Created: 2020-03-29 05:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 326ea1d225fd1e7769d99563348ac52b SHA-1: 3f317034b001369e9485df813e1b522669464d0b SHA-256: fd9d2a14908b0f64cf783dc141291f78a3155f8e0a52fd76d9163db3d74cb0f3
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 structured as SEO-optimized PDF lures. The document body, though heavily obfuscated, contains a URL that appears to be a review for a Dell Precision T1700 workstation. This suggests a social engineering tactic to drive traffic to malicious sites, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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://74-123-73-226.mgwnet.com/uploads/1/3/0/8/130874035/130874035.html#dell+precision+t1700+xeon+review
    • http://campusvms.com/uploads/1/3/0/7/130775921/nodobexavijavo.pdf
    • http://vendeus.com/uploads/1/3/0/4/130483266/lirujozi-lomiwiveporise-zujitubopoda.pdf
    • http://scarletcarnival.com/uploads/1/3/0/6/130621061/3281332.pdf
    • http://necroscape.com/uploads/1/3/0/6/130604448/simisiwapojibezojon.pdf
    • http://mhevesi.com/uploads/1/3/0/6/130621392/1813824.pdf
    • http://123stp.com/uploads/1/3/0/7/130775808/a522209a95b.pdf
    • http://generousandkind.com/uploads/1/3/0/7/130738527/2055248.pdf
    • http://ridgedogs.com/uploads/1/3/0/8/130814007/2714f3d.pdf
    • http://2210enterprisedrive.com/uploads/1/3/0/7/130738513/6e6f3d.pdf
    • http://www.wwwclaudeyvanconneart.studio/uploads/1/3/0/6/130604923/kujusub.pdf
    • http://hendersonchristianoutreach.com/uploads/1/3/0/9/130969754/duvof-vomakoz-tisakoxifidemu-zefovuxav.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_off000086dc.bin
5467741bba9784728684b91ff8c33abd6618147dad96249750c681bb5ecf854a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86DC 8812 bytes

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