Malicious PDF — malware analysis report

Static analysis result for SHA-256 0056da3aa4a8514a…

MALICIOUS

PDF

32.7 KB Created: 2020-06-11 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96323b84eb1c81866ad3ef3c9d8f6ce8 SHA-1: 39e8ba1f6776f561d7d78b3ca10ac4e0e15ef41f SHA-256: 0056da3aa4a8514ad98b30675450dc0b600710afa8f5c976cf5373b09c689059
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, characteristic of a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF_SEO_LINK_FARM heuristics confirms the suspicious nature of the embedded URLs. The document body, though containing text about guitar exercises, is likely a lure to disguise the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kingstontowingco.ca/uploads/1/3/0/7/130739597/130739597.html#beginner+guitar+scale+exercises
    • http://mta-sts.greenlifehauling.com/uploads/1/3/0/7/130775528/450dd4ce.pdf
    • http://ltplocal.com/uploads/1/3/1/4/131454791/74ea9fe140.pdf
    • http://vdspilates.com/uploads/1/3/0/4/130476462/b29836bc730208b.pdf
    • http://sing-llc.com/uploads/1/3/0/3/130313468/ralokefuzibekip.pdf
    • http://elevateciereview.com/uploads/1/3/1/4/131453527/bemoge.pdf
    • http://unitas-breslau.com/uploads/1/3/0/4/130435556/472881.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://dekupuwapo627084595.files.wordpress.com/2020/06/18598705876.pdf
    • https://ruvasitib.files.wordpress.com/2020/06/73584379410.pdf
    • https://nideboxaso.files.wordpress.com/2020/06/wesupupidizakaluwoxid.pdf
    • https://disosilawube351438687.files.wordpress.com/2020/06/43723848702.pdf
    • https://gufugovu66145005.files.wordpress.com/2020/06/vuledusazobumukuwejawupo.pdf
    • https://jubowut.files.wordpress.com/2020/06/74043925384.pdf
    • https://wesobitid.files.wordpress.com/2020/06/50677973416.pdf
    • https://befupigivef.files.wordpress.com/2020/06/banisemawazo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057a6.bin
c824dea0a2b13ef1c3394597087e74497ce334aebe543495351fd39072e4dc50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57A6 9320 bytes

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