Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb174c538f5857b…

MALICIOUS

PDF

44.9 KB Created: 2020-03-27 14:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f813707bc7a378e9448ad71fc32fdb76 SHA-1: fa033cd71ce0a73686d52ecb54ccdedac3b18acf SHA-256: ffb174c538f5857b8bf4e5844213099a602253907e6907e6bf8d6bea821c1c91
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, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains text related to clothing images and references the wkhtmltopdf tool, indicating it was likely generated programmatically to host these links. The ML classifier strongly supports the malicious nature of this PDF.

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://alyaqtha.com/uploads/1/3/0/5/130588940/130588940.html#fotos+de+prendas+de+vestir+en+ingles
    • http://www.bostoneducationcompact.org/uploads/1/3/0/7/130776076/4497785.pdf
    • http://www.cheryltesslersolitfoundation.com/uploads/1/3/0/7/130739619/kufuluteduvivej_besufugalixogek_defama.pdf
    • http://militarytravelsales.com/uploads/1/3/0/7/130775654/451886.pdf
    • http://mariannstefanelli.com/uploads/1/3/0/5/130588299/zosez.pdf
    • http://angelustempleav.com/uploads/1/3/0/7/130776514/judipubujigised.pdf
    • http://pavenaturally.com/uploads/1/3/0/6/130621819/lemokixinak.pdf
    • http://leagueofwickedstepmothers.com/uploads/1/3/0/2/130271102/zirofuzej-bosobajexu.pdf
    • http://nimatennis.com.au/uploads/1/3/0/3/130323268/ef65e89f97.pdf
    • http://jbinsurancesolutionsinc.com/uploads/1/3/0/4/130476401/73a374881c968.pdf
    • http://www.smartschoolskiosk.com/uploads/1/3/0/8/130813369/8166185.pdf
    • http://keyhive.com/uploads/1/3/0/2/130272260/1215386.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000726b.bin
bd24e85b47ca4eb4b24b3a222e2122832fb01739526e24ea75e729ef0c43fe62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x726B 8352 bytes
font_01_sfnt_off00009126.bin
f31c439e28d0137206b91a151f21343900f846ed9ff070250fbe82eb1cc7da1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9126 16204 bytes

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