Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27ff31b077a701f…

MALICIOUS

PDF

52.7 KB Created: 2020-04-05 06:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0f556e999c926af23f937934156e6d21 SHA-1: 14c77606e0cb66a1197150f896fe7cca0912e11a SHA-256: c27ff31b077a701f618df226dcf3d3b289ef191cb810b3dc61e5fcdb6640e8f4
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body contains a mix of seemingly innocuous text and numerous URLs, suggesting its primary purpose is to redirect users to other potentially malicious PDF files hosted on various domains. 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://bwsinvestments.com/uploads/1/3/1/4/131453049/131453049.html#cathedral+short+story+summary
    • http://sdpinqueen.com/uploads/1/3/0/5/130547624/gadapazip.pdf
    • http://lmff.org/uploads/1/3/0/3/130323934/tosodonu.pdf
    • http://healthviewfitness.ca/uploads/1/3/0/3/130323984/xugukuxogi.pdf
    • http://btwtalentshow.com/uploads/1/3/0/9/130968943/1660614.pdf
    • http://www.europimec.org/uploads/1/3/0/8/130874372/lozigurenevi-wewivonowobon-jisivuru-vivurusosod.pdf
    • http://silveroceangroup.com/uploads/1/3/1/4/131452937/zamiminodalopizu.pdf
    • http://barrheadlionsclub.com/uploads/1/3/1/0/131071066/domuronuvuloj.pdf
    • http://mountainsouthdesigns.com/uploads/1/3/0/4/130491852/8172827.pdf
    • http://florespowerwashing.com/uploads/1/3/0/2/130291491/a00f74.pdf
    • http://jffrystevens.com/uploads/1/3/0/8/130874076/buxujoza_remejanafeza_rodawifedurad_pivoxak.pdf
    • http://wkerrygardnerconstruction.com/uploads/1/3/0/5/130588575/6610762.pdf
    • http://theeyephotos.com/uploads/1/3/0/6/130604694/e94af52866.pdf
    • http://eehenry.com/uploads/1/3/0/6/130640110/7089153.pdf
    • http://brittainresorts.net/uploads/1/3/1/1/131164375/woworuwizurak.pdf
    • http://centralnorthcommunity.org/uploads/1/3/1/4/131410399/likaweraralasigupi.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_off0000a6e9.bin
a55c1249d3843fc4e3f99e52455891d881d3eb00977453229347b03a87915afc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E9 7764 bytes

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