Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d0827e5a46f8c9…

MALICIOUS

PDF

59.3 KB Created: 2020-03-15 08:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4fb4e0655d6c4fc89a5c168ff549b10d SHA-1: a29669ed8d02649262b02b8d75d3f2bbc8495373 SHA-256: 05d0827e5a46f8c9d088c976b6f6c034e2ae10e7492016df347c5f317f3f6a99
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many of which point to other PDF files on unrelated domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm heuristic. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oldkingpartners.com/uploads/1/3/0/7/130775540/130775540.html#anorectal+malformation+complications
    • http://jordisglamdivas.com/uploads/1/3/0/6/130604651/1b968478.pdf
    • http://musicaltaste.dextercommunityorchestra.org/uploads/1/3/0/5/130588427/9072648.pdf
    • http://csraisc2.com/uploads/1/3/0/6/130639903/5475877.pdf
    • http://leboutiquebelleame.com/uploads/1/3/0/4/130488500/posipotava.pdf
    • http://leaguecitypersonalinjurylawyers.com/uploads/1/3/0/6/130639439/786e8698.pdf
    • http://iepcheeranddance.net/uploads/1/3/0/4/130435947/wewumuzitudaden-xudurokutate-dosalowu.pdf
    • http://consul.biz/uploads/1/3/1/1/131163776/0d5d2789d9.pdf
    • http://krgteach33.com/uploads/1/3/0/6/130605299/xamadojutimujuga.pdf
    • http://iamdtf.net/uploads/1/3/0/8/130814246/nodobojolomajo_xefebarif_dolujasadolezif.pdf
    • http://ladiligencia.biz/uploads/1/3/0/8/130874396/lotisarake-pemik-nimewilef.pdf
    • http://mikaimtrading.co.za/uploads/1/3/0/3/130379078/bexuf_mataga_zivip.pdf
    • http://www.alcine.com.co/uploads/1/3/0/6/130604295/8810143.pdf
    • http://angelasresidentialcare.com/uploads/1/3/0/6/130605258/dafdef3c458914.pdf
    • http://webmail.richlandchurch.com/uploads/1/3/0/5/130588616/fidudobidunur.pdf
    • http://www.jaxpropertyinspections.com/uploads/1/3/0/6/130622106/resukutiwenikutori.pdf
    • http://www.manhattanexpress.com.au/uploads/1/3/0/6/130604538/kilonanenorawek.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5b4.bin
486c42fae3f5da23ad0c50e355035d72db3f06a9f142f16022d9784a5c3dfdb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 8228 bytes
font_01_sfnt_off0000d562.bin
7f00688a7fa1435ce172dcb840d0263443ffd2a42c0a0825bd4151cb67b82d29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 2696 bytes

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