Malicious PDF — malware analysis report

Static analysis result for SHA-256 c327a5952e014b32…

MALICIOUS

PDF

30.9 KB Created: 2020-03-24 03:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dfaa0403a9445dbd70292c13ce8d2bb2 SHA-1: ff4a4e1078a7911a0a8893559227e06237b577a6 SHA-256: c327a5952e014b32171322c9900974251d21976ff85b2aba0a1d88983e3a3765
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various websites, a technique commonly used in SEO link farms or for redirecting users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious nature of the embedded URLs. The document body, though partially corrupted, contains a URL that aligns with the link farm heuristic.

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://blacktreelofts.com/uploads/1/3/0/3/130379295/130379295.html#imagenes+de+ambiente+rural+y+urbano+para+colorear
    • http://ninecriticalmonths.com/uploads/1/3/0/7/130739039/d1e71aa2f.pdf
    • http://www.namastae.ca/uploads/1/3/0/5/130588380/ef6d899d4f71.pdf
    • http://kleeboutique.com/uploads/1/3/0/7/130776452/086aec6a2f448.pdf
    • http://www.positivegrind.org/uploads/1/3/0/6/130620455/2fb27d664.pdf
    • http://richardlaycockstudio.com/uploads/1/3/0/7/130775135/7212983.pdf
    • http://myherbalmate.com/uploads/1/3/0/8/130874569/fdb6d10.pdf
    • http://1beechbrewing.com/uploads/1/3/0/4/130436078/jetimef.pdf
    • http://mail.bentleyulrich.com/uploads/1/3/0/5/130547515/bozaw.pdf
    • http://hireforbehavior.com/uploads/1/3/0/7/130740517/3241824.pdf
    • http://www.macsbrickhouse.com/uploads/1/3/0/5/130588813/1216397.pdf
    • http://absolutewater.net/uploads/1/3/0/4/130436415/648d2.pdf
    • http://coffeyvillelivestockmarket.com/uploads/1/3/0/3/130379117/83e12fec6.pdf
    • http://brandingidol.com/uploads/1/3/0/3/130313106/1911532.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_off000053bf.bin
ded5f76be9c310012acefabd940217a4af9fd141ec80e132f97772ff44866a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53BF 6580 bytes

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