Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68938c1a1987562…

MALICIOUS

PDF

39.1 KB Created: 2020-04-04 14:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 315f6463d297117c8e210f44d5e494c3 SHA-1: 9358b37ec6c837411746379fdd889f66068cbfc4 SHA-256: f68938c1a1987562b3ab00fe17007b77d085e4b096bbe54850a2c025e9132ea8
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDFs hosted on various domains. The 'PDF_SEO_LINK_FARM' heuristic specifically identifies this pattern, suggesting the document's primary purpose is to redirect users through a network of sites. The ML classifier also strongly indicates maliciousness. No scripts were extracted, but the extensive use of external links points towards a malicious redirection or content-hosting scheme.

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://soundwaveentertainment.org/uploads/1/3/0/5/130539992/130539992.html#oraciones+afirmativas+negativas+e+interrogativas+en+ingles+con+used+to
    • http://salonsuccess.co/uploads/1/3/1/1/131163615/5427114.pdf
    • http://geekpursuits.org/uploads/1/3/0/6/130621206/21b6f0.pdf
    • http://strawberryblonde.be/uploads/1/3/0/2/130271042/bufaj_xosonijewefep.pdf
    • http://coloursbox-sunomono.com/uploads/1/3/1/3/131379444/pemumifasepuz.pdf
    • http://sandwichislandsnetwork.org/uploads/1/3/0/8/130813033/4636207.pdf
    • http://laniakearetreat.org/uploads/1/3/1/3/131384255/zizoju.pdf
    • http://minivid.net/uploads/1/3/0/6/130620691/kokebogopalidom.pdf
    • http://nicolemglenn.com/uploads/1/3/0/7/130739117/98e73c18a.pdf
    • http://stedsbigredrace.com/uploads/1/3/0/5/130589009/7367b3.pdf
    • http://rumohr.org/uploads/1/3/0/6/130621569/3197788.pdf
    • http://kimkaysen.com/uploads/1/3/0/6/130604615/769204.pdf
    • http://warriordom.com/uploads/1/3/1/4/131407552/3369006.pdf
    • http://drlaurensterner.com/uploads/1/3/0/6/130639291/375d87902842b5.pdf
    • http://brizo-kennel.com/uploads/1/3/0/7/130775156/totedemusa_bulituwezunow_riveketumowu_jifezevutegot.pdf
    • http://mattsamberg.com/uploads/1/3/0/2/130289453/pozelodame-nifarokamilidi-salos-tumizidewid.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_off00006da4.bin
c94c45c29fcf2f8e77c54f3b1a8338371fcb5b119c6ae8d7e30109fd711b98ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA4 8416 bytes

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