Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfefe21886e42f9f…

MALICIOUS

PDF

42.0 KB Created: 2020-04-14 13:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d49a3b7db0d648da2e1d9da16e4a5b33 SHA-1: d10fd05c0fa75ebfa63b2deaa87a1d0814eebcdb SHA-256: dfefe21886e42f9f4dd4f1602495a379c08bbbd73471a9808e446b588e62da23
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files on different domains. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be to redirect users to these external resources, which could host further malicious content or be part of a link-farming scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://beingself-centered.com/uploads/1/3/0/2/130271224/130271224.html#heroine+anthem+zero+trophy+guide
    • http://agsportsbar.com/uploads/1/3/1/4/131453679/wunasoxubagukav.pdf
    • http://metteherold.dk/uploads/1/3/1/0/131071019/vinor_kiromonuxoziw_jowaragil_kigajafudi.pdf
    • http://a2z-pestcontrol.com/uploads/1/3/0/2/130271157/jirokazavemetor_zegutud_nuwiteba.pdf
    • http://frontlinefordogs.net/uploads/1/3/0/3/130313319/7020801.pdf
    • http://roswellgame.com/uploads/1/3/1/3/131398131/lawovivojela-zabipedufibiwol-kabaxubukomawa.pdf
    • http://fringeparenting.com/uploads/1/3/1/1/131164164/safudisogeb-luvulo-tovujunet-gofosetato.pdf
    • http://perennialpaintingllc.com/uploads/1/3/0/7/130738632/vinafuje.pdf
    • http://roswellgame.com/uploads/1/3/1/3/13
    • 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_off00007b56.bin
4ed2ad6606144ecb5b1951a22e20da5a979b331fc0557e7204217b5b754bdf7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B56 8692 bytes

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