Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e784fbdaa4e6cc…

MALICIOUS

PDF

35.5 KB Created: 2020-04-09 04:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 159cc555218b7f881d204a6580452bda SHA-1: 4cfd4447412842a42f73262c6f85da2a7108363f SHA-256: f4e784fbdaa4e6cc57258cb985da3e90f83f478d071dfc1345a531f7c3528c4b
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to similarly structured URLs on different domains, indicating a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are likely used to redirect users to potentially malicious sites or to host further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://newjerseyhomebuyerseminar.com/uploads/1/3/1/4/131483491/131483491.html#tuberia+pvc+precio+bolivia
    • http://heart-and-soul-therapy.com/uploads/1/3/0/2/130287367/posoxopotevok_texun_gozoz_dejoxule.pdf
    • http://hqwallpapersfree.com/uploads/1/3/0/3/130313755/60a820.pdf
    • http://daisyrock.net/uploads/1/3/0/6/130605222/dazotukujos.pdf
    • http://flaccidtest.com/uploads/1/3/0/4/130494636/kuwuzok.pdf
    • http://cerrocellars.com/uploads/1/3/0/5/130544898/jazibuvatoxodemu.pdf
    • http://charlesaheiner.com/uploads/1/3/0/5/130588288/4486e81325.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_off00005f21.bin
f1f29205c25cb2dc9bf49cf7b15b9c8daefcadcd2d1cc9cdce86ac3133b7d4be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F21 9176 bytes

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