Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf12b1c014c4f88e…

MALICIOUS

PDF

36.9 KB Created: 2020-06-21 12:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 336d4ed54d4c271e636e186373904fd4 SHA-1: fe72723ae099159ad57898b7b955342f7655646c SHA-256: bf12b1c014c4f88e7a5b34b44bf0cb36dda11fab0e3a4f2afcca385495edd95d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a large number of embedded external links to other PDF files hosted across numerous domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://gvfso.org/uploads/1/3/2/6/132681296/132681296.html#lessons+on+snakes
    • http://mta-sts.mx.causerconditioning.com/uploads/1/3/1/3/131380942/2794561.pdf
    • http://benetechconnection.com/uploads/1/3/0/6/130621501/sevejamotetuga.pdf
    • http://scubaphone.org/uploads/1/3/0/8/130874317/linunujidukepug-janekoso-vowixesilojo.pdf
    • http://mail.moonessence.com/uploads/1/3/0/7/130775998/5d7b5fa4.pdf
    • http://bookkeepingbycindy.com/uploads/1/3/0/9/130969406/didolexafalepal_ziganaf_todumaruduxogup_kodet.pdf
    • http://mail.ttowngrows.com/uploads/1/3/1/6/131606124/9280918.pdf
    • http://debbiepriestess.com/uploads/1/3/1/4/131409244/sirekerudukeziz.pdf
    • http://suryokencono.com/uploads/1/3/0/6/130604644/xilewotikuwu-depawimexow-bododuzixal.pdf
    • http://byronestates.com/uploads/1/3/0/4/130483376/rozupugu_lezunegerane_fafejori.pdf
    • http://theartguard.com/uploads/1/3/1/4/131453370/3003316.pdf
    • http://aaroncharlesg.com/uploads/1/3/1/3/131398308/2244701.pdf
    • http://74-123-73-221.mgwnet.com/uploads/1/3/1/6/131636833/vuromifob_nigajomoxune_gifubasufu_xuwenufulorekil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057eb.bin
e73397a165489be06e1d6c3ec4b0bcb0a5634be01979b73672f6543e3e437ba6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57EB 4216 bytes
font_01_sfnt_off00006632.bin
f6f3c0024542d751c64ef2c38d33da1314a533ba42fa5f06d6a20e5c1d907a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 9692 bytes

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