Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea32d2e495d4777…

MALICIOUS

PDF

31.8 KB Created: 2020-04-05 10:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 30ee734083153915f114d804bc140763 SHA-1: b6c4f7c031fdd4ba2b74d6826a45a82e564cffa0 SHA-256: 1ea32d2e495d4777e768aa8d9222e1b0e4d24a832e12ab0b5d18eb546596af67
94 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 hosted on unrelated domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The document body, though partially garbled, contains a URL that likely serves as the initial lure, directing users to a chain of further malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://verrem.studio/uploads/1/3/1/4/131437418/131437418.html#how+many+carbs+in+a+diet+cherry+limeade+slush
    • http://mercadeoverde.com/uploads/1/3/0/2/130289775/9916831.pdf
    • http://mopeg.net/uploads/1/3/0/5/130550744/d897b.pdf
    • http://deliveryinmotion.net/uploads/1/3/1/1/131163734/ebe57aea613.pdf
    • http://medleyboutique.com/uploads/1/3/0/2/130289189/putavuka-xepizake.pdf
    • http://gopurefitness.com/uploads/1/3/0/6/130621628/9a4b88692fb8.pdf
    • http://infinitycomm.net/uploads/1/3/0/6/130639450/buduvir.pdf
    • http://assuredprinterrepairs.com/uploads/1/3/0/6/130639228/17b5fe76ab81.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_off0000564a.bin
63f48a2d62be87e5659f73ed462fe8377191683d5577c64879e9abc3fc2ed1a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x564A 7032 bytes

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