Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb3894a8fc56290…

MALICIOUS

PDF

39.5 KB Created: 2020-04-04 11:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eceaa83ce0237601111a80e3295db09a SHA-1: b30153048915ff5380ebc492d8546e8f18688c1a SHA-256: 5cb3894a8fc5629020bf81a3798820f96c57a897e2bd63acf6853c5173f1d856
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm or SEO spam, containing a large number of external links to various domains. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. While no scripts were explicitly extracted, the embedded URLs suggest an attempt to redirect users to potentially malicious content or to manipulate search engine rankings. The document body itself contains garbled text and some of the extracted URLs.

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://ebmccallanbuildingltd.com/uploads/1/3/1/0/131069886/131069886.html#10+example+of+conjunctions+words
    • http://trulensphotography.com/uploads/1/3/0/6/130639710/vomiruzusopufelewek.pdf
    • http://jsmtaxlawyer.com/uploads/1/3/0/7/130739105/vopeza.pdf
    • http://metoodartmouth.com/uploads/1/3/1/0/131070611/8706364.pdf
    • http://azdeserthomewatch.com/uploads/1/3/0/9/130969680/xugokame.pdf
    • http://repurposeforgood.com/uploads/1/3/0/3/130313144/lujogumo_gejobobujinom_nalegarap.pdf
    • http://managerasateamnavigator.com/uploads/1/3/0/3/130324234/7280101.pdf
    • http://wisconsindentalcenter.org/uploads/1/3/1/4/131406086/bixixidobigunumo.pdf
    • http://chelseakinser.com/uploads/1/3/1/4/131406879/dobekumumerubo_mavukajeta.pdf
    • http://ingerlene.net/uploads/1/3/0/6/130604601/tebizisusuxikuwivob.pdf
    • http://mariosaenzlandscapingservices.com/uploads/1/3/0/7/130776735/badinixuv.pdf
    • http://emmafoulkes.org/uploads/1/3/1/4/131454102/748d02dad533e.pdf
    • http://hcclonline.com/uploads/1/3/0/4/130483384/wovekonererizoj-vejizagomuwatad-movasaxi-pelobi.pdf
    • http://clearwash.fr/uploads/1/3/0/5/130588795/lapadogude.pdf
    • http://observationsandconclusions.com/uploads/1/3/0/4/130483519/womobutuv.pdf
    • http://ideas.promo/uploads/1/3/0/8/130815192/lisamalimora-wakile-sososuteli.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_off00006d8d.bin
46769ee93a6984ece1d3059a30cea3d05de8f3fdcda603e3c7b123f8ae7f47e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8D 8732 bytes

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