Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a623244663183e2…

MALICIOUS

PDF

36.7 KB Created: 2020-05-28 04:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcc86ee087bb28d15946c36c4db73f32 SHA-1: 9423a968b9ca3733e031005b212b39bbeae888cf SHA-256: 9a623244663183e2aab69209c5123bcbd1ac3b89279f7741b792620d73117fa8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by an ML classifier as malicious with high confidence. It contains a large number of external links, a technique often used in SEO spam or phishing campaigns to drive traffic to malicious sites. The document body contains garbled text and references to 'Polk audio psw125', suggesting a lure for product-related searches. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://tiantianboshishicai.br3h.com/uploads/1/3/0/3/130379123/130379123.html#polk+audio+psw125
    • http://rhettiehq.com/uploads/1/3/0/5/130589435/wetuna.pdf
    • http://westsidenaturalcleaners.com/uploads/1/3/0/7/130776648/bffa8ae44f0ae.pdf
    • http://louisaspeaks.com/uploads/1/3/0/5/130588635/jutamupowux.pdf
    • http://metroexaminer.us/uploads/1/3/0/6/130604382/samupopezagefe.pdf
    • http://jonwygens.com/uploads/1/3/0/5/130539928/juxatawifadajez.pdf
    • http://longmica.com/uploads/1/3/0/8/130814247/0f61ef4a68c.pdf
    • http://midtownbodyworks.com/uploads/1/3/1/3/131382693/bajutisarixipobifum.pdf
    • http://hannahins.com/uploads/1/3/0/4/130436020/6f43d.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_off00006263.bin
6e8d2fc1f0ffa8f50077fc7a5f959fb69562eaa9d0b8e6d3d3d8be3a2f8e5020		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6263 10916 bytes

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