Malicious PDF — malware analysis report

Static analysis result for SHA-256 d978a6b9264a9298…

MALICIOUS

PDF

29.3 KB Created: 2020-05-30 05:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3823f6391522342597701da170358e22 SHA-1: fc36e283a0356ef81a83cc46d8cb484bf684c7e1 SHA-256: d978a6b9264a9298c6a985ebe921c5a4bb2ec52cb19e793676018115788d4f96
94 Risk Score

Malware Insights

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

This PDF document contains a large number of external links to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body itself is heavily obfuscated but contains some of the same URLs found in the heuristics, reinforcing the link-distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://qwrjh.bpmtc.com/uploads/1/3/1/4/131482823/131482823.html#libros+de+planeacion+estrategica+pdf
    • http://hashtagcorp.com/uploads/1/3/1/8/131871390/6927595.pdf
    • http://mariabraganini.com/uploads/1/3/0/4/130492229/mojimok_dezifapawebelag_sukumulavagoze.pdf
    • http://lateronline.com/uploads/1/3/0/4/130483638/gutepobetivefug.pdf
    • http://happyhaunts.art/uploads/1/3/0/7/130776626/pexovama_disesemedon.pdf
    • http://anandiandme.com/uploads/1/3/1/3/131380969/nopoj_riwuviretu_lesir.pdf
    • http://aisagency.net/uploads/1/3/0/6/130603818/9695368.pdf
    • http://hcchi.net/uploads/1/3/1/8/131871883/bavuzavaxira.pdf
    • http://thethorns.news/uploads/1/3/0/6/130620195/2481076.pdf
    • http://aayogaandfitness.com/uploads/1/3/2/3/132302768/nazupenewitesonawapi.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_off000046ec.bin
c8c51bb48d6eb276c59fe2098d81dfefc80539348e171936355740a175e9a313		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46EC 10376 bytes

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