Malicious PDF — malware analysis report

Static analysis result for SHA-256 7895e0838ad88f55…

MALICIOUS

PDF

32.8 KB Created: 2020-06-08 13:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba58f7fb24c11d2370e7397ed32d927f SHA-1: 840302527ea9fb5421151dd19d83e5cc3d05f2b7 SHA-256: 7895e0838ad88f557115dde6d520e8ea686f662465b589918c95cc035e6202f5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous links suggest an attempt to redirect users to potentially malicious sites, possibly for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://froehlich-kaltenberg.de/uploads/1/3/1/4/131453657/131453657.html#butterball+xxl+electric+turkey+fryer
    • http://plasticsintallahassee.com/uploads/1/3/0/4/130488539/kuzujikufuwup-budofefemigelet-jigalusarepo-vajopugazagu.pdf
    • http://millionairemomasia.com/uploads/1/3/0/5/130589409/mabevuxinusena_buzudigotivi.pdf
    • http://autodiscover.americanitaliancancer.org/uploads/1/3/0/5/130541384/bixagowetatupuf.pdf
    • http://thehbcstudio1.com/uploads/1/3/1/8/131872144/6871296.pdf
    • http://designedwithpurpose.org/uploads/1/3/0/5/130542769/biwabog.pdf
    • http://stillscollective.com/uploads/1/3/1/4/131437766/d8a8ac.pdf
    • http://bertaxelanderson.com/uploads/1/3/0/6/130640024/zoxuxif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://vuremaxetil.files.wordpress.com/2020/06/gapisufarititifefapava.pdf
    • https://xizezoni.files.wordpress.com/2020/06/sugesatitevinevomipi.pdf
    • https://dimedadifum.files.wordpress.com/2020/06/fazovixo.pdf
    • https://nitinaxu.files.wordpress.com/2020/06/73668569573.pdf
    • https://rabujibud.files.wordpress.com/2020/06/satafagarudexat.pdf
    • https://xadixijep.files.wordpress.com/2020/06/35606500255.pdf
    • https://dajejunej.files.wordpress.com/2020/06/rirufazuguropexix.pdf
    • https://patogoxabade.files.wordpress.com/2020/06/32936320508.pdf
    • https://remumalu.files.wordpress.com/2020/06/repalosigimudar.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005502.bin
64ede10501ce524cf4c92d9859e79c8b1a7b50377bdaeef7086b7626f4e53613		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5502 10336 bytes

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