Malicious PDF — malware analysis report

Static analysis result for SHA-256 750386f858b5ed52…

MALICIOUS

PDF

39.4 KB Created: 2020-04-10 09:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 37aca4e298456607fd4b0075adb07ca9 SHA-1: 250192a36400d04333eaee619410bf9e71f2c2e2 SHA-256: 750386f858b5ed5240422d932c3f79a165d81eb646c2125b7d904e88637e3f42
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are structured as SEO spam or potential phishing lures. The document body, though partially garbled, includes a title suggesting a benign topic ('Interpretacion del test de la figura humana en ni 0os pdf') to mask the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a malicious classification.

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://luxurybodysaltz.ca/uploads/1/3/0/4/130435555/130435555.html#interpretacion+del+test+de+la+figura+humana+en+ni%C3%B1os+pdf
    • http://gof-udea.com/uploads/1/3/0/8/130874154/e3fe74.pdf
    • http://hoops4thefuture.com/uploads/1/3/1/1/131164246/1200600.pdf
    • http://littlepeachfeet.com/uploads/1/3/1/0/131070198/damega.pdf
    • http://maceventsco.com/uploads/1/3/1/3/131398515/aaf67a9a.pdf
    • http://mdplumbingandheating.org/uploads/1/3/0/5/130543106/6db57b680.pdf
    • http://pressandstitch.com/uploads/1/3/0/7/130739824/5807032.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_off00006dc8.bin
fcad6bb4a1e93850d822f806667bdb64cfc9b61cd8d17649b55b8a0e96cec9d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC8 9000 bytes

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