Malicious PDF — malware analysis report

Static analysis result for SHA-256 109c24c7329118ff…

MALICIOUS

PDF

43.1 KB Created: 2020-03-13 03:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ecdef21398b322f2af2c655c169262e5 SHA-1: a69087272165b345a2a54cce90fab2b71ee74b49 SHA-256: 109c24c7329118ff053dafb472a8499a1368a1c629bfab1ace722fabc1f2da97
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's part of a link farm operation. The ML classifier also strongly indicated maliciousness. The embedded URLs likely lead to further malicious content or phishing pages, and the document's structure is designed to manipulate search engine results or distribute malware.

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://fotografiamajooper.com/uploads/1/3/0/2/130291827/130291827.html#what+is+acute+myocardial+infarction+of+anterolateral+wall
    • http://bethlance.com/uploads/1/3/0/3/130379864/5c61504700.pdf
    • http://dbbcso.org/uploads/1/3/0/2/130274304/3312615.pdf
    • http://larton.org/uploads/1/3/0/5/130590700/gowezedokojizadokepo.pdf
    • http://arrowsteam.org/uploads/1/3/0/7/130775741/7b357901.pdf
    • http://patternpod.com/uploads/1/3/0/5/130547924/d54ee3a0dca4.pdf
    • http://ocseocali.com/uploads/1/3/0/6/130620859/3c9e229d.pdf
    • http://oxygencharge.com/uploads/1/3/0/4/130490602/5059218.pdf
    • http://exterwoodwork.com/uploads/1/3/0/8/130874086/b640be.pdf
    • http://dcgoldbuyers.com/uploads/1/3/0/5/130539002/gisixefekukali.pdf
    • http://familykinection.com/uploads/1/3/0/7/130738635/judawux.pdf
    • http://webdisk.kerjabersamajepang.com/uploads/1/3/0/9/130969405/9283875.pdf
    • http://weenlightenment.com/uploads/1/3/0/3/130323632/katowuwivi.pdf
    • http://www.musictheoryhelper.com/uploads/1/3/0/5/130539728/251e18a5a1b.pdf
    • http://mail.napiercounselling.co.uk/uploads/1/3/0/7/130740127/kijonoj_nosuj_lezoxitepuxa.pdf
    • http://www.atelier-tat-ort.de/uploads/1/3/0/6/130621125/5927843.pdf
    • http://toptierhealthandfitness.com/uploads/1/3/0/9/130969599/9567c4eb8.pdf
    • http://audiobedostudio.com/uploads/1/3/0/5/130590092/bowob.pdf
    • http://mx.geraldclark77.com/uploads/1/3/0/8/130874381/6140912.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_off0000800a.bin
d254a87a15c48846bd665348486085d558ac362a15449c0799cb0e30354de5b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x800A 7808 bytes

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