Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd924b8d446d1d63…

MALICIOUS

PDF

35.2 KB Created: 2020-03-30 19:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 34b55ed523635e70a092aa4cf7fcc3f0 SHA-1: 7e9384f40a4d542a8e73f628da7cd5cfd73ab869 SHA-256: fd924b8d446d1d63d4b45c880c835127a34cd7dddae6a1c88c0d94539d73a9d8
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, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. This suggests the primary purpose is to manipulate search engine results or to serve as a distribution point for further malicious content. The ML classifier strongly supports the malicious verdict.

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://pszapped.com/uploads/1/3/1/0/131069838/131069838.html#capresso+4+cup+espresso+
    • http://4mahin.com/uploads/1/3/0/8/130813413/f5aa13fd1b1a.pdf
    • http://flysamba.com/uploads/1/3/0/9/130970003/jojexafere.pdf
    • http://regeneraglobal.org/uploads/1/3/0/7/130775516/gutapefe_lirutuzowa_gaviwo_zotike.pdf
    • http://hypnotiqueolmecpunch13.org/uploads/1/3/0/6/130639489/a22fd7ad3ef12d.pdf
    • http://pesoclinic.com/uploads/1/3/1/4/131436966/xifasidodofo-laluroden-pobekakulifav.pdf
    • http://bgmnephrology.com/uploads/1/3/1/0/131070198/7957802.pdf
    • http://lttvisas.com/uploads/1/3/0/7/130776046/6407ceb1.pdf
    • http://consol2001.com/uploads/1/3/0/6/130605302/kilozizuxitalujediba.pdf
    • http://lahaina.gallery/uploads/1/3/0/4/130435905/f989bbea7c1a8c1.pdf
    • http://yeahmateyeah.net/uploads/1/3/0/7/130738758/4840994.pdf
    • http://paularuizbarrilero.com/uploads/1/3/0/6/130604369/denenadululefu_fegazinul_pevapeloxot_zabuxuvam.pdf
    • http://makemusicdayrocks.com/uploads/1/3/0/5/130547552/6224043.pdf
    • http://marabird.com/uploads/1/3/0/7/130776291/d621d13.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_off00005dcc.bin
d83cad25a0c8db13ed04c55afdbff136acde9aefac01929f1f585d5b89170b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCC 8648 bytes

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