Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5017b1ad40748fd…

MALICIOUS

PDF

36.9 KB Created: 2020-03-30 04:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 264f31e3b6f24974c5745661d2299aa6 SHA-1: 2e58da2c9fbd96fa4f88cc4241b2ab6afe1a2fe8 SHA-256: c5017b1ad40748fd3651a7cb451813f44c045d642d98c208a9eab962dee3eb2c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. The embedded URLs point to various domains, likely serving as lures to unrelated content or further malicious sites.

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://cecilyeiferle.com/uploads/1/3/0/5/130590456/130590456.html#functions+modeling+change+a+preparation+for+calculus
    • http://diyprohelp.com/uploads/1/3/0/8/130813643/1080346.pdf
    • http://mrchiraqq.com/uploads/1/3/0/5/130551468/pizijej.pdf
    • http://generaltonytata.com/uploads/1/3/0/5/130541208/befevozus.pdf
    • http://waldun.net/uploads/1/3/1/0/131071035/womol.pdf
    • http://s-old.net/uploads/1/3/0/2/130273846/naxesonituxazot.pdf
    • http://atemainc.com/uploads/1/3/0/7/130776558/velokajagetitoko.pdf
    • http://dwconstco.com/uploads/1/3/0/5/130550876/ebccc6d3903.pdf
    • http://bordercityhippies.com/uploads/1/3/0/8/130874641/56f39514de9.pdf
    • http://hostmaster.pttp.org.au/uploads/1/3/1/4/131453061/9ab483d04a08da.pdf
    • http://owngov.net/uploads/1/3/0/9/130969205/5320678.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_off0000689a.bin
a833f28892b6677a6c83e80d0cd3fec433167056d7a26cb6db8635d85a9e9e06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x689A 7584 bytes

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