Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccc4c79cac98bb99…

MALICIOUS

PDF

36.9 KB Created: 2020-04-13 15:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fa8fd3a33e6109173858de976195e026 SHA-1: 17adacdecd8508b9c0bdb538103b0896333de808 SHA-256: ccc4c79cac98bb99595494c9d1f0c0e4566fa0445f47ba981b3f90d555769359
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on unrelated domains. This behavior is indicative of a link farm or SEO manipulation tactic, likely intended to host or redirect to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://hardhathomeinspection.com/uploads/1/3/0/5/130543276/130543276.html#vishnu+sahasranamam+pdf+in+english+with+meaning
    • http://lotusgardensanimalsanctuary.org/uploads/1/3/0/4/130435721/08a4bf9f8c0b.pdf
    • http://billscarolinabbq.com/uploads/1/3/1/4/131438163/rikog-morogijadirital.pdf
    • http://norfolknyfire.org/uploads/1/3/1/1/131164261/sijaxu.pdf
    • http://comedianjordanjackson.com/uploads/1/3/0/6/130640141/wibawabogimagiwo.pdf
    • http://empoweronelife.com/uploads/1/3/0/9/130969137/savapunukobav.pdf
    • http://hostmaster.improvemywifi.co.uk/uploads/1/3/0/5/130590177/5511980.pdf
    • http://championyorkiepuppies.com/uploads/1/3/0/8/130814923/dadazugamif_fegema_mewukukoxupa_gilovifip.pdf
    • http://championyorkiepuppies.com/uploads/1/3/0/8/130814923/dadazugamif_fegema_mewukukoxupa_gilovif
    • 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_off000068c9.bin
997d9edfac8539e17230fce5ae023a5ca8fd8ddae36bd2d92a34ee4984b89347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C9 8012 bytes

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