Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3255d32c9efa2b…

MALICIOUS

PDF

38.5 KB Created: 2020-04-06 15:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2681e3f815070be7d392a1cbb6853e6f SHA-1: 8f77681ab91413fb6effd7d1df48002224ce4434 SHA-256: cd3255d32c9efa2b4d4832c6cbf5facbfc4a13becf8148c5d5b5ad5be2c94b30
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The presence of numerous SEO-like PDF links suggests an attempt to manipulate search engine results or distribute potentially harmful content through a network of compromised websites.

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://weatherproofguide.com/uploads/1/3/0/5/130588344/130588344.html#stephen+covey+the+8th+habit+from+effectiveness+to+greatness
    • http://aurafximaging.com/uploads/1/3/0/4/130483650/kawofa.pdf
    • http://artofecology.org/uploads/1/3/0/8/130813883/0f86550d547a06.pdf
    • http://tearsfortrystyn.com/uploads/1/3/1/4/131438685/8882932.pdf
    • http://newlifefitz.org/uploads/1/3/0/4/130483215/vomesomu.pdf
    • http://gbnewsroom.com/uploads/1/3/0/7/130775832/6083629.pdf
    • http://crewcover24.com/uploads/1/3/0/7/130775371/xaloropa.pdf
    • http://xxquisiteboutique.com/uploads/1/3/0/4/130435881/bb3d3df24c827.pdf
    • http://botanicalbabies.com/uploads/1/3/0/5/130540240/basulavuzezo.pdf
    • http://trulyoffensive.com/uploads/1/3/0/5/130539231/zelilu_jalofir_mibirasogoroxe.pdf
    • http://dronestuff.com/uploads/1/3/1/4/131482850/suwik.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_off00006e4f.bin
2859581246d4d63372fca0eabb75b221f82190df47fd6f728187439e3490ad51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4F 7872 bytes

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