Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b087dbe0336418a…

MALICIOUS

PDF

42.7 KB Created: 2020-06-17 00:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fac19c8c1b350fa09c9e3c28d05c3bf1 SHA-1: a689778fae9d6c6a91a21ab603bf6c4b074642a9 SHA-256: 0b087dbe0336418ac8b4d4bf08472c07ab959f78a7f17f1f3bc2aec266ff91c0
104 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam tactic, potentially used to distribute malicious content or manipulate search engine rankings. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trendyfarmerblog.com/uploads/1/3/1/8/131872149/131872149.html#tv+exercise+machines
    • http://niaanicole.shop/uploads/1/3/1/4/131408204/de435.pdf
    • http://loanblack.com/uploads/1/3/0/8/130813618/janabojiwumoz.pdf
    • http://mazzeomusicstudio.com/uploads/1/3/0/6/130605492/1070586.pdf
    • http://cpanel.delaneydrywall.com/uploads/1/3/0/2/130287997/0e460a2f.pdf
    • http://concussionhealthsummit.com/uploads/1/3/0/4/130436483/1596372.pdf
    • http://2zm.undesirable.us/uploads/1/3/0/5/130550910/6938965.pdf
    • http://thefrosteddoughnut.com/uploads/1/3/0/6/130621158/9faa1d257c6b3f.pdf
    • http://banudivinity.com/uploads/1/3/1/6/131637108/jatumewigikefidexub.pdf
    • http://iicforsuccess.net/uploads/1/3/1/1/131164173/rimalogukunemel.pdf
    • http://ashavida.org/uploads/1/3/1/4/131483488/9565341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a7b.bin
913c2928c7f3a4798310c80017c49130184d57a0fad0c76c173b2cd49d635b51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7B 4684 bytes
font_01_sfnt_off00007a25.bin
673fdc99a75ebdeb9049baa3b746121b1b72433840a3fe5da1f633131d32a7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A25 10932 bytes

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