Malicious PDF — malware analysis report

Static analysis result for SHA-256 244b2f49e55607f9…

MALICIOUS

PDF

37.8 KB Created: 2020-06-05 02:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df007eeb2652c009208392e1c0d8036d SHA-1: 16d72e8e2e3996990d84a1e07629c126b36fb01d SHA-256: 244b2f49e55607f9c29653d3aaba23a30bc065e68a2cd80b5209018be0724a89
94 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a common technique for distributing malware or directing users to phishing sites. The ML classifier strongly indicated maliciousness. The document body, though obfuscated, contains references to URLs that are part of a link farm, suggesting a coordinated effort to host malicious content. The primary identified host, 'thepdxkeep.com', is associated with a significant number of these links.

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://1pu5v.bpmtc.com/uploads/1/3/1/3/131381166/131381166.html#dogwood+health+trust
    • http://thepdxkeep.com/uploads/1/3/1/8/131857000/172594.pdf
    • http://briannagluszak.com/uploads/1/3/1/8/131871509/5063563.pdf
    • http://createdesignrestore.com/uploads/1/3/0/8/130873759/litewemuv.pdf
    • http://chasethebugs.com/uploads/1/3/1/4/131454352/1438387.pdf
    • http://jjmockcleaning.com/uploads/1/3/0/2/130272438/sixufokewesebegap.pdf
    • http://parapety-kanclerz.pl/uploads/1/3/1/6/131636843/9294937.pdf
    • http://paralleltechllc.net/uploads/1/3/0/5/130539696/4311389.pdf
    • http://verkauf.studio/uploads/1/3/0/4/130483416/76a0e0.pdf
    • http://slumi.net/uploads/1/3/0/4/130488884/tisuwadububupiv-xamebabiwebiroz-dojajepataku.pdf
    • http://yourbusinesssolutions.org/uploads/1/3/0/6/130603918/525325.pdf
    • http://yujiaohong.com/uploads/1/3/1/8/131871408/7228825.pdf
    • http://1pu5v.bpmtc.com/uploads/1/3/1/3/131381166/terms.html
    • http://1pu5v.bpmtc.com/uploads/1/3/1/3/131381166/dmca.html
    • http://1pu5v.bpmtc.com/uploads/1/3/1/3/131381166/policy.html
    • https://jorasemop.files.wordpress.com/2020/06/17744460647.pdf
    • https://xetepufupeso.files.wordpress.com/2020/06/pokufelilokukewubagovuj.pdf
    • https://zazozimoje.files.wordpress.com/2020/06/filazenopawexalazixudelif.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_off000066e8.bin
9722ca713c8860263275744a318ca993e64c2ccbdb591ba6c7e1b83aecef008e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E8 10780 bytes

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