Malicious PDF — malware analysis report

Static analysis result for SHA-256 77797af0e4b3c6a9…

MALICIOUS

PDF

33.6 KB Created: 2020-04-24 12:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 24287760e33a8036741fab069982ffb5 SHA-1: 036442ce5a5408734cfb8bfc938e4cd2fdde26da SHA-256: 77797af0e4b3c6a94e878ee93cae81fc545fca8ef5ee7da2c9a929bf91dbee5a
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to other PDF files on different domains, indicating a link farm. The primary URL, http://marmarworld.com/uploads/1/3/0/4/130488829/130488829.html#blow+your+mind+dua+lipa+video, suggests a lure related to popular culture to entice users. The presence of numerous unknown URLs suggests a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://marmarworld.com/uploads/1/3/0/4/130488829/130488829.html#blow+your+mind+dua+lipa+video
    • http://4wd-specialist.com/uploads/1/3/0/7/130775951/2a1abf4ae.pdf
    • http://idiacuisine.com/uploads/1/3/0/2/130272390/3aef11e244cb751.pdf
    • http://opulentfxtrading.com/uploads/1/3/0/6/130621321/vagibunuvujur-rosafoli.pdf
    • http://opsalerter.com/uploads/1/3/0/6/130605229/894977.pdf
    • http://aerialstudios.net/uploads/1/3/0/2/130289427/3234181.pdf
    • http://gweltonandassociates.com/uploads/1/3/0/7/130739095/javoxonup-tovolis.pdf
    • http://legaleasecanada.com/uploads/1/3/1/4/131437254/bozumadexa.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_off000051ec.bin
eec7c1ce63d0853a500c26d88dfa44d2aff670fcf8816d8d5d88c868e820df54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51EC 11984 bytes

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