Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fee442de3748e6e…

MALICIOUS

PDF

40.2 KB Created: 2020-03-23 05:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dbcea8fcf4a17497dab1ca87ce111e65 SHA-1: 46a3c61d342276395200aa994a7b071a37d10c7f SHA-256: 3fee442de3748e6e510e266cc1bc7c7499c5bd0df0053d72f20eacad4db7d65d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external PDF files, disguised as a legal document. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, suggesting a tactic to distribute malicious content or engage in SEO abuse. The ML classifier strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages.

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://cfthomas.com/uploads/1/3/0/2/130272438/130272438.html#modelo+de+demanda+por+incumplimiento+de+contrato+de+compraventa+automotor
    • http://favefoto.com/uploads/1/3/0/4/130476322/1269b09.pdf
    • http://fromcountingcows2calculus.com/uploads/1/3/0/6/130639665/c336bd.pdf
    • http://serdogan.com/uploads/1/3/0/6/130639901/fuled.pdf
    • http://tristarlogos.com/uploads/1/3/0/2/130288644/lenaraxofufuxed.pdf
    • http://northernnerd.com/uploads/1/3/0/7/130776308/5682201.pdf
    • http://www.caloundramowing.com/uploads/1/3/0/7/130740018/gefusolel_tuzumajodumo_lebevagebipit.pdf
    • http://www.mikepricephotography.com/uploads/1/3/0/8/130873822/2719933.pdf
    • http://mycarnabyscooter.com/uploads/1/3/0/4/130488691/1c69673539880.pdf
    • http://www.hanksins.com/uploads/1/3/0/8/130874535/6076024.pdf
    • http://www.doggiestyles.net/uploads/1/3/0/2/130272328/2428605.pdf
    • http://weoccupyin.org/uploads/1/3/0/5/130551058/buladesoxeketujukowu.pdf
    • http://www.hvhauling.com/uploads/1/3/0/7/130775734/safafiwovumubimuf.pdf
    • http://savewithcare.com/uploads/1/3/0/2/130271185/9808286.pdf
    • http://sylphmedia.com/uploads/1/3/0/2/130291588/4719349.pdf
    • http://bilgi.info.tr/uploads/1/3/0/2/130287817/0ce60705787.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_off000073a6.bin
2a7504e49057b5cbaf308fc57f1a2c2aa1604df0f250610f31b9f656664ad3c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73A6 8640 bytes

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