Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35a000ae10c5a00…

MALICIOUS

PDF

34.2 KB Created: 2020-04-28 17:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 21ff77a6c89cc3df18de51defbef3513 SHA-1: b404bb5003f581ae2b426451b7d6a8e7e3b258fe SHA-256: a35a000ae10c5a0033e139209d098d33c959e4679fff516a97842502e217b2b4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The ML classifier also strongly indicated maliciousness. The embedded URLs point to various domains, likely serving as lures or hosting further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://zenithhr.net/uploads/1/3/0/7/130739392/130739392.html#cavaleiros+do+forr%C3%B3+2018
    • http://carinabianca.com/uploads/1/3/0/6/130604407/5deef56d.pdf
    • http://adulttoast.com/uploads/1/3/0/6/130620356/d161ff8f6fb78.pdf
    • http://mankatocomedy.com/uploads/1/3/1/4/131453542/sevijuron_baxesum_magijizef.pdf
    • http://motoxboys.com/uploads/1/3/0/6/130604689/53b342c1a4a1b2.pdf
    • http://alyssacrawfordart.com/uploads/1/3/0/6/130621832/tedez.pdf
    • http://www.hoyfundraiser.org/uploads/1/3/1/6/131607703/bonobo_vasekisudijel_vomolux_biviwi.pdf
    • http://privatechefdelci.com/uploads/1/3/0/7/130739867/zusaro.pdf
    • http://cbdoilsladyforshops.com/uploads/1/3/0/7/130739379/limevegewikonar-kutalejetaz-litepex-wokaj.pdf
    • http://614septic.com/uploads/1/3/1/3/131381369/kirakizonez-lodubotex.pdf
    • http://magicalgirlstarot.com/uploads/1/3/0/6/130639273/zikorulededatu-digugeju-jukib-nusedaruji.pdf
    • http://www.hoyfundr
    • 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_off000056e5.bin
451c12b560700d30da39ce9733d8db8f5077dd4282e2ff0a5c0b316f9ebb3a99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56E5 11188 bytes

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