Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cda6dc914669153…

MALICIOUS

PDF

39.5 KB Created: 2020-04-09 19:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 48142f508d0d997d596877822ea707e1 SHA-1: 1f39ad101e13f364e396986e3790ae31099c8c24 SHA-256: 5cda6dc91466915300c2f3ab274fa6ca68ef15eb58c1f5479746618f5de5b160
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 pointing to other PDF files on different domains, which is indicative of a link farm or SEO abuse. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, potentially for further exploitation or to manipulate search engine rankings.

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://designerkitchensbaths.com/uploads/1/3/0/6/130639532/130639532.html#difference+between+primary+and+secondary+deviance
    • http://utrofeu.com/uploads/1/3/1/4/131437085/3002342.pdf
    • http://aishadhunterphotography.net/uploads/1/3/0/6/130639305/d76baf0538070c5.pdf
    • http://ttime-golf.com/uploads/1/3/1/3/131379990/finogojoniruw.pdf
    • http://hmpstead.com/uploads/1/3/0/2/130291589/5972477.pdf
    • http://foxriverpottery.com/uploads/1/3/0/5/130589174/2775a847.pdf
    • http://sendyouasong.com/uploads/1/3/0/3/130313253/9784f609.pdf
    • http://elitehomesandimprovements.com/uploads/1/3/0/4/130476866/5888624.pdf
    • http://milesaheadco.com/uploads/1/3/1/3/131381241/8267970.pdf
    • http://formewifi.com/uploads/1/3/0/4/130489054/7e7b86d66029.pdf
    • http://locototejerky.com/uploads/1/3/0/7/130776068/beruboz.pdf
    • http://inspiredtravelsolutions.net/uploads/1/3/0/8/130874671/jawafowabumagewejafe.pdf
    • http://mangoxan.com/uploads/1/3/0/5/130543467/9687008.pdf
    • http://maxrepsleague.com/uploads/1/3/1/4/131407763/zovub.pdf
    • http://mpoweringpotential.com/uploads/1/3/0/6/130639936/begum.pdf
    • http://thecompassionateasskicker.net/uploads/1/3/0/8/130814805/lubomumeme.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_off00007279.bin
766c6eb79b48b5fedd04e2cf66b8774405943e6beedbc3af51354401e6952517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7279 7748 bytes

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