Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67accfef0f4d66e…

MALICIOUS

PDF

41.4 KB Created: 2020-05-23 07:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f701072ed1291f19fa62db576b46d82b SHA-1: 00a556f4463b703d20140dfe822d5662627a10a3 SHA-256: c67accfef0f4d66e0ce41f0075304f42732eaea562425d0f27c01f93fd3b1256
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, also contains URLs. These links likely serve to direct users to malicious content or to manipulate search engine rankings. The ML classifier strongly indicated maliciousness.

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://1am.undesirable.us/uploads/1/3/0/6/130604013/130604013.html#the+street+ann+petry+sparknotes
    • http://tonylenta.net/uploads/1/3/1/4/131408328/6375874.pdf
    • http://nakedtrackdays.net/uploads/1/3/0/6/130640139/pepuzodomituruwox.pdf
    • http://opti-shield.com/uploads/1/3/0/2/130270752/pabisolosaviwigis.pdf
    • http://stevengosselin.com/uploads/1/3/1/4/131408082/volepilav.pdf
    • http://mhmotter.com/uploads/1/3/1/4/131437477/gobabamufupa_suvefamovenide.pdf
    • http://smithvetservices.com/uploads/1/3/0/7/130775551/zadifozubiponefinup.pdf
    • http://trackpics.ca/uploads/1/3/0/3/130379216/7085109.pdf
    • http://onlineshopgalore.com/uploads/1/3/1/8/131860938/legelirotirabaguvupa.pdf
    • http://hostmaster.bethanyhomestead.co.uk/uploads/1/3/1/3/131383283/tobew.pdf
    • http://sandreed.com/uploads/1/3/1/1/131163867/7126106.pdf
    • http://1901ironworks.net/uploads/1/3/0/8/130813614/rirepaviradalujazeve.pdf
    • http://hellodaryn.com/uploads/1/3/0/3/130379821/9a1b3501ea5bd.pdf
    • http://cablevault.net/uploads/1/3/0/8/130813757/9440504babfd94.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_off000077c5.bin
6aeb50423926083a512f8adc0e72602a952667cab91cc2e713d089dab41d207d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C5 10104 bytes

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