Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9d8846834fcf9b…

MALICIOUS

PDF

35.9 KB Created: 2020-05-23 10:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a792c8c48f8db77a10220fb81a8348c SHA-1: fa6b4342698cf6c28de95370fefef7cb3e835cf9 SHA-256: 3b9d8846834fcf9b848b4e59990e2767f92a0b66cab03c7a2035cd65572b5c83
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, which could host further malicious content or be used for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://tomiortiz.com/uploads/1/3/1/8/131871778/131871778.html#excess+eye+boogers
    • http://pipingenie.com/uploads/1/3/1/3/131382133/3600555.pdf
    • http://vickimartinmua.com/uploads/1/3/0/2/130289557/fedejibix.pdf
    • http://aku-pasrah.org/uploads/1/3/1/8/131856317/nopanime_mavusobamiwopi.pdf
    • http://reformedvoluntaryist.com/uploads/1/3/0/6/130604244/879214.pdf
    • http://zoom-formation.fr/uploads/1/3/1/4/131409755/489daff7.pdf
    • http://ecvssedu.com/uploads/1/3/1/6/131606169/leborapi_minevonibu_womiditixereze_ropaxijol.pdf
    • http://trishsfamilydaycare.com/uploads/1/3/1/1/131164318/fasunigewuxa.pdf
    • http://ccluxurytravelgroup.com/uploads/1/3/0/3/130323594/8142755.pdf
    • http://romelicensedguide.com/uploads/1/3/0/6/130604782/repusesadogi_xenebopufu_movalorop_tapapu.pdf
    • http://rduckgodchildrenministryfoundation.com/uploads/1/3/0/6/130620438/vajupomigakigorus.pdf
    • http://metronashinspect.com/uploads/1/3/0/7/130738919/baximot_jadataf.pdf
    • http://revsurfco.com/uploads/1/3/1/4/131454466/jesumubizometi_girapam.pdf
    • http://mrlongsmathtasticwebsite.com/uploads/1/3/0/4/130491008/ededf2a.pdf
    • http://wwwkosmetikdasilva.com/uploads/1/3/1/8/131871516/mirufag-tigufojefise-vebuxewi-faxum.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_off00006437.bin
4c4754f0cf6c3d0d2c8ad72c67ed4c09e2a06321807a4a9d04eec061d97bb8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6437 9484 bytes

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