Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ad36a32dc072d8…

MALICIOUS

PDF

29.9 KB Created: 2020-04-12 15:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b819a0c73551f285a2b273bebbebe291 SHA-1: 530eadf6c91a8608e4ebe80803e8e7d7ba2f33e2 SHA-256: 88ad36a32dc072d869b053ce5439c44cd04c74276bbe706c3d0e4b9fe4bebe94
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO abuse tactic. The document body, though partially corrupted, contains references to a 'service manual' and URLs that further support the lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://montanapurewood.com/uploads/1/3/1/4/131438038/131438038.html#sharp+lc-42d62u+service+manual
    • http://billbrice.info/uploads/1/3/0/5/130588207/1178366.pdf
    • http://worldtreecollective.com/uploads/1/3/1/4/131438420/babub-zorebinewawanal-tapobemaf-sobifenaru.pdf
    • http://shoptheclubhouse.com/uploads/1/3/1/4/131453146/dafewalufukovab.pdf
    • http://thesunatlantic.com/uploads/1/3/1/4/131406386/f5545c4e27.pdf
    • http://hdfamilydentistry.org/uploads/1/3/0/7/130738484/8be06.pdf
    • http://pixelateduniverse.net/uploads/1/3/0/5/130551338/lonup.pdf
    • http://greenschoolbrooklyn.com/uploads/1/3/0/7/130738896/8047240.pdf
    • http://dilvideo.com/uploads/1/3/0/5/130545932/1024775.pdf
    • http://areaair.space/uploads/1/3/0/4/130489054/pixafadojinok.pdf
    • http://becausecommunicationsllc.com/uploads/1/3/0/8/130814245/kodifojugiparep.pdf
    • http://profesionallashes.com/uploads/1/3/0/6/130604351/6c7a205739.pdf
    • http://pirate-vape.com/uploads/1/3/0/2/130287281/vavusotekole.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_off00004dbe.bin
250e08f55207bc05f1e462aee210a008a5c454ff542faa510a7a089c623a1ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DBE 7588 bytes

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