Malicious PDF — malware analysis report

Static analysis result for SHA-256 161bb80e78c70095…

MALICIOUS

PDF

49.9 KB Created: 2020-04-07 21:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 72a6ffa5b1e918e71491b004a7f2c3d0 SHA-1: 14b3b8227e8bcaefe7da2c3a10d283c054079249 SHA-256: 161bb80e78c70095b4a7dd55bac6d827995a1a27eb382842c6e08a4891c2617c
96 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a 'PDF_SEO_LINK_FARM' indicating a large number of embedded external links. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of this link farm, suggesting a lure to potentially malicious websites. No scripts were extracted, but the presence of numerous external links points towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://absystemsllcscam.com/uploads/1/3/0/6/130621052/130621052.html#melones+bollo+wikipedia+las+poses
    • http://opelaz.com/uploads/1/3/0/7/130775501/fuwomuronoforut_towakibi_fovevabe.pdf
    • http://rbcarpentry.org/uploads/1/3/1/4/131406855/8518a63ac139ca7.pdf
    • http://capriexpressllc.com/uploads/1/3/0/2/130271043/jazerebekixog.pdf
    • http://paintmecrazy.com/uploads/1/3/1/0/131069899/gagab.pdf
    • http://gameupnow.com/uploads/1/3/0/6/130604188/41f59ba773b.pdf
    • http://wellnesscenternwj.com/uploads/1/3/0/8/130814769/7232279.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ab1.bin
7439888365e1a575f63c828adf25fc52a3d3943edcf198aed0cb99fdb8c88603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB1 9092 bytes
font_01_sfnt_off00009bcd.bin
4cda5f785b161ab6df9682e6368fd2c101e9aa902a3f31947a361fc50cf1a95c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BCD 2732 bytes
font_02_sfnt_off0000a584.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA584 16036 bytes

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