Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee2df865bb313ee…

MALICIOUS

PDF

41.4 KB Created: 2020-03-29 11:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 18497c1d49d9dab4fcf0458d46a60f9e SHA-1: 821d6e834e0016dc45f1bba8b3c8ca073cee502e SHA-256: dee2df865bb313ee98c0af92af4cb8b3cd6282fdfe45725d74d2406b08155554
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a link farm or SEO spam tactic, likely intended to direct users to malicious sites or distribute further malware. 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://74-123-79-151.mgwnet.com/uploads/1/3/1/1/131163664/131163664.html#sanitarium+health+
    • http://micheldumont.ca/uploads/1/3/0/7/130775866/4ae33a7d32.pdf
    • http://gilliansvoice.com/uploads/1/3/0/5/130589056/lesorexiwoj_kotezidifadewij_losusok.pdf
    • http://mangospace.online/uploads/1/3/0/6/130639307/2996442.pdf
    • http://hackthemouse.net/uploads/1/3/0/6/130639719/junejufene_jezuzesulafuz.pdf
    • http://jen-n-outlaws.com/uploads/1/3/0/5/130588231/sisafegazufam.pdf
    • http://stewartmechanicalcontractors.com/uploads/1/3/0/9/130969942/juvogi.pdf
    • http://buunk-trading.nl/uploads/1/3/0/4/130483050/ea7321.pdf
    • http://theresalarkin.org/uploads/1/3/0/2/130270953/55b11ef7a.pdf
    • http://morganhillcarpetcleaning.com/uploads/1/3/0/3/130379101/fidetonumevilorawuto.pdf
    • http://ministryequalshelp.com/uploads/1/3/0/6/130621775/wotubuwoze-pijavegunizo.pdf
    • http://thebigsave.com/uploads/1/3/0/2/130291910/4150884.pdf
    • http://caniblissart.com/uploads/1/3/0/4/130490117/4228470.pdf
    • http://profloorsllc.org/uploads/1/3/0/6/130604191/1585149.pdf
    • http://mrb2btechwriter.com/uploads/1/3/0/7/130775011/55946b394adf5.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_off000076f1.bin
008565bfdc64bdecbddf7bd87e195db3b72ac0bdd63620009ff1c9de8bd979d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76F1 8412 bytes

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