Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0048641132d0e3…

MALICIOUS

PDF

44.3 KB Created: 2020-03-29 11:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a96203bf65d865c8d4a359af1763b458 SHA-1: 6f33b35d99180f8be68657891d946bacfa00d1ec SHA-256: 9a0048641132d0e39eecfe309ba9ce2ed8edf19020a45ce71c8529fe09291c61
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files with numeric slugs, indicating a potential link farm or SEO poisoning attempt. The document body, though partially corrupted, includes a title related to soil porosity and mentions wkhtmltopdf, suggesting it's a generated document. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of external URLs.

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://bodyworkbybarb.com/uploads/1/3/0/4/130483400/130483400.html#porosidad+de+un+suelo+franco+arcilloso
    • http://www.forestestates.org/uploads/1/3/0/6/130640023/8241367.pdf
    • http://hccvermillion.org/uploads/1/3/0/6/130639776/1451874.pdf
    • http://honoru.org/uploads/1/3/0/3/130379113/ditibabi-fofatado-gaxalotij-naginejitapanu.pdf
    • http://www.northbrookfloodstudy.org/uploads/1/3/0/8/130874046/novomesu_tananex_jiturumonudupi.pdf
    • http://lachinetruckrepair.com/uploads/1/3/1/3/131381706/zumopujumajofasa.pdf
    • http://hostmaster.willemlagerwaard.nl/uploads/1/3/0/5/130550681/vowezigagopoworugati.pdf
    • http://webidscr-verifyaccount.info/uploads/1/3/0/2/130288864/8d0b3985a8ba9e.pdf
    • http://coachsupervisiongroups.com/uploads/1/3/0/7/130739878/fiwomexamudu-sivelubobe-wujobum.pdf
    • http://pintsizechef.com/uploads/1/3/0/7/130775866/suritiluvipofojidipo.pdf
    • http://figgyandjiggydesigns.com/uploads/1/3/0/7/130740010/5bcf8512.pdf
    • http://hostmaster.claireslater.co.uk/uploads/1/3/0/5/130540284/f1db65c50686.pdf
    • http://hanlyphotography.com/uploads/1/3/0/7/130776309/6a85aeb0c6eb.pdf
    • http://beautyandthebeach.org/uploads/1/3/0/7/130775309/6722440.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_off00006ba0.bin
a21357bfa87d1cc5f6f6ed6680e2689a0dd1e3c6dd17e8d7f7cc6d6a90a35dc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA0 8956 bytes
font_01_sfnt_off00008c24.bin
1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C24 16312 bytes

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