Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d779a0c413e83d…

MALICIOUS

PDF

43.0 KB Created: 2020-04-11 14:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a7666c92ddc5749afdd808cc22c0b0c6 SHA-1: d65bee1f6904fd4ac1c9683726addeb3efc3061b SHA-256: d3d779a0c413e83dd356ba47c47330cbc06af9e0c04190d9c8d151fd1b64e011
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The primary heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is an attempt to manipulate search engine results or distribute malware through a network of compromised sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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
  • 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://le-manuel-du-toeic.fr/uploads/1/3/0/4/130476417/130476417.html#the+happy+vegan+fearne+cotton
    • http://priorityundertakings.com/uploads/1/3/0/4/130435755/238302.pdf
    • http://estuaryoutfitters.com/uploads/1/3/1/4/131437850/nevonakikazori.pdf
    • http://mvpinnovations.com/uploads/1/3/1/3/131381946/1903578.pdf
    • http://sydneymusicproject.com/uploads/1/3/1/3/131384301/vikevasofusugog.pdf
    • http://conteseniles.com/uploads/1/3/0/6/130639910/fofajefosibav.pdf
    • http://augustacarenetwork.com/uploads/1/3/0/7/130775012/fiwurovinuvuz_zojofijexod.pdf
    • http://doremeandyou.com/uploads/1/3/0/8/130873728/kekuzakovaser-lalar-tufebamezuput.pdf
    • http://massagetherapisthawaii.com/uploads/1/3/0/8/130874634/pujorajose.pdf
    • http://banks-photography.com/uploads/1/3/0/7/130775682/4089311.pdf
    • http://salesmatix.com/uploads/1/3/0/5/130550836/e3695a9dc5e0ccd.pdf
    • http://lakewoodelementary.net/uploads/1/3/0/2/130289648/nodexenalof.pdf
    • http://rescue4paws.com/uploads/1/3/0/2/130289541/1365642.pdf
    • http://salesmatix.com/uploads/1/3/0/5/130550836/e3695
    • 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_off00007f51.bin
9130fb776353a4a716221837878aa045bc407ca67bf04068ccd97d16614bb73d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F51 8520 bytes

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