Malicious PDF — malware analysis report

Static analysis result for SHA-256 861115c0feb82f0b…

MALICIOUS

PDF

46.1 KB Created: 2020-03-17 09:53:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fe91dfab9f4a7bd27f912408183fe7c7 SHA-1: 481085819dcd92c926b59b9ec23a459ad80a7b51 SHA-256: 861115c0feb82f0b2a5e19ec1fc6924a3db890aa7dc226588e29227d879b3dd9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file exhibits characteristics of a link farm or SEO spam, containing a large number of external URLs pointing to other PDF documents. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. The primary purpose appears to be directing users to a vast network of hosted content, potentially for malicious distribution or search engine manipulation.

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://torontoexiles.com/uploads/1/3/0/2/130272936/130272936.html#ejemplos+de+trabajos+en+formato+ieee
    • http://spokaneroofingcontractors.com/uploads/1/3/0/6/130639526/muledika.pdf
    • http://www.jonnyessex.com/uploads/1/3/0/6/130604560/reluxeziwujovikep.pdf
    • http://hopeyouthroc.org/uploads/1/3/0/8/130874582/1869d0aeaac0904.pdf
    • http://jinbangyulechengzhucewangzhi.f18.ebkf.org/uploads/1/3/0/6/130622059/fakorudekew_tafutijuxaxitow.pdf
    • http://me2umassage.com/uploads/1/3/0/6/130639740/zuginorewatosulejizo.pdf
    • http://tipsycow.net/uploads/1/3/0/4/130476740/3925320.pdf
    • http://www.mmalm.com/uploads/1/3/0/5/130539341/gepofi-salevugeb-porefo.pdf
    • http://www.nathanpoulson.co.uk/uploads/1/3/0/6/130605403/a25b7972c705b3.pdf
    • http://mindfulprofits.co/uploads/1/3/0/7/130775151/lolibu.pdf
    • http://shortroundapparel.com/uploads/1/3/0/7/130775810/jepidi.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071c2.bin
ff20fb1bf6d3e8cd00b4fa75e4b4af801c93126e8b59a814b7201e45aff32254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C2 10204 bytes
font_01_sfnt_off00009482.bin
5a9695438bb362a8b10d86f415c06da9d71f416851af8c6c9c762304ce3c8158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9482 16088 bytes

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