Malicious PDF — malware analysis report

Static analysis result for SHA-256 320a140fabbd81ac…

MALICIOUS

PDF

34.6 KB Created: 2020-04-10 06:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25bd25c5186605db7f99981e6406785c SHA-1: 4db019b14a1aee5be023d0229fcd91870c9e2ca5 SHA-256: 320a140fabbd81acb099086e892507ab1fadda4af92b2b12ce96a1493612e138
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The embedded URLs point to a network of sites, suggesting a coordinated effort to distribute content or redirect users. No scripts were extracted, limiting the analysis of direct payload delivery.

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://three-ps-in-a-pod.com/uploads/1/3/0/3/130379381/130379381.html#watlow+ez-zone+pm3+manual
    • http://sparkspcrepair.com/uploads/1/3/1/4/131410311/razowedajekuvu.pdf
    • http://invaluableman.com/uploads/1/3/0/4/130476970/5962285.pdf
    • http://drsharonsterne.com/uploads/1/3/0/5/130551401/717981.pdf
    • http://holisticmassagenow.com/uploads/1/3/0/5/130551229/zevezepeged_zoreji_dinifutem_mogilesub.pdf
    • http://getyourpotentialunlocked.com/uploads/1/3/0/3/130379179/7454065.pdf
    • http://smokychickendenver.com/uploads/1/3/0/6/130621488/19fb5.pdf
    • http://yourenotsick.com/uploads/1/3/0/6/130621844/9549642.pdf
    • http://cheshirecounsellingandpsychotherapy.com/uploads/1/3/1/6/131636988/linup.pdf
    • http://dbeacdbeprogramconsult.org/uploads/1/3/0/4/130483319/1272fb.pdf
    • http://onesingleflock.com/uploads/1/3/0/7/130775791/3342338.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_off00005e2d.bin
7fcbf73e1a39080ca2d89f7f97d5cb34d4489ce61839ca031ec9a85d1764abee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2D 8124 bytes

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