Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c555e43dce7b9e…

MALICIOUS

PDF

45.0 KB Created: 2020-06-17 00:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33a0db71c09d4b6a5afdd7fb9185d57a SHA-1: 6eab253c4e64c5712612d08bcf7ed2f587ed153a SHA-256: 54c555e43dce7b9e21e7e073b5c8e85a49b3634cc0ca97daea219494185a8cc9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links to various domains, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body also contains embedded URLs, including 'http://4hg.undesirable.us/uploads/1/3/1/3/131380345/131380345.html#moto+g+india+manual'. This suggests the document is designed to drive traffic to these external sites, potentially for SEO manipulation or to host malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://4hg.undesirable.us/uploads/1/3/1/3/131380345/131380345.html#moto+g+india+manual
    • http://keerbergen.info/uploads/1/3/0/8/130814157/197648.pdf
    • http://designerfundraising.org/uploads/1/3/0/5/130551129/6924874.pdf
    • http://atlhomecleaner.com/uploads/1/3/0/4/130492963/eb2b7744d152.pdf
    • http://krazytails.com/uploads/1/3/1/4/131407178/sawupikuv.pdf
    • http://modestgirlzrock.com/uploads/1/3/1/4/131437755/9273318.pdf
    • http://angellightreiki.com/uploads/1/3/1/4/131438759/dozibebigud_tapunixiduzup_ketojaxuzutor.pdf
    • http://wellnessreclamation.com/uploads/1/3/1/8/131871614/vawabagaxamaje.pdf
    • http://mail.getmessynl.com/uploads/1/3/0/6/130639854/wukunovetixa_sotup_bawoke_jivabekuborov.pdf
    • http://slfexhibition.com/uploads/1/3/0/4/130477039/9000201.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bdd.bin
6b77eb6e36890944042f5015244c181f74f45f5e940eeddf48936b750bd5b445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDD 4640 bytes
font_01_sfnt_off00006b8c.bin
9e77ba683d20cdb40f22f7825b9e8fc8f938d1818993f12eaeead3fc0995d750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8C 10840 bytes
font_02_sfnt_off000090b9.bin
00e5034bf99f3d6efe00a25a3bfa276cf159795ad76b0562490920772022da12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90B9 16264 bytes

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