Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7c29c534f3cfa56…

MALICIOUS

PDF

32.1 KB Created: 2020-05-30 05:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f09faf956d8dfecc75346e8ad74a26 SHA-1: 664ec6440530daddadcc3f57ba55bd1a06fc52ce SHA-256: b7c29c534f3cfa56b950515eda96ca1e289331d9e9f0167b854f6308a88bcab8
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of multiple unknown URLs strongly suggest malicious intent. The document body, though heavily obfuscated, contains text related to 'flash cards' and the authoring application 'wkhtmltopdf', which is consistent with a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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://2on.undesirable.us/uploads/1/3/0/5/130588266/130588266.html#number+flash+cards
    • http://homeboximmobilier.com/uploads/1/3/0/2/130272284/9887428.pdf
    • http://catavision2030.org/uploads/1/3/0/4/130488691/dupodepodofoxok-wotumu-relosoxedojalo-nowalinalan.pdf
    • http://thespikegamer.com/uploads/1/3/0/4/130478205/pidip-bepamonukazufez-dirilug.pdf
    • http://vlad.tv/uploads/1/3/0/2/130288731/kexudowijikivo.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_off00005473.bin
c4b1e0f103d293ddb6932c41ad26c633c3fa93051b3a248b654408201aa06805		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5473 9816 bytes

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