Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2ad0d65eca84f9…

MALICIOUS

PDF

46.2 KB Created: 2020-03-30 22:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 862f7b09d2c5c2ac7abf2c0cbe070f1e SHA-1: 4d1477e2f78aeb46a4f0da620cabd6e97a95d500 SHA-256: 6a2ad0d65eca84f9b5674f18e4c9adc970bec741f2c0504c8ece244ae812b49d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified as a link farm. The primary URL, http://feel-well.org/uploads/1/3/1/3/131383247/131383247.html#norcold+rv+fridge+troubleshooting, appears to be a lure for users seeking troubleshooting information. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

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://feel-well.org/uploads/1/3/1/3/131383247/131383247.html#norcold+rv+fridge+troubleshooting
    • http://elminvestors.com/uploads/1/3/0/9/130969312/bepafotaforider_xefof.pdf
    • http://saveourplanetbio400.com/uploads/1/3/0/5/130588773/a58fd4baf3cca3e.pdf
    • http://shansbands.com/uploads/1/3/0/5/130589218/losafekalabada_zaluguvatol.pdf
    • http://eccevideo.net/uploads/1/3/0/6/130639400/5219608.pdf
    • http://kosherinchina.com/uploads/1/3/1/0/131070187/vibupu_logisowugujerur.pdf
    • http://texasluxuryrestroomtrailers.com/uploads/1/3/0/7/130739029/e897b55537.pdf
    • http://dsabids.com/uploads/1/3/0/7/130775606/e823fa8.pdf
    • http://urzedo.com/uploads/1/3/1/3/131379564/melonoxofuruj_gokupawofu.pdf
    • http://cuestaasociados.com/uploads/1/3/1/3/131398141/5409338.pdf
    • http://grandcanyonhelicopter.fr/uploads/1/3/0/5/130540286/4655708.pdf
    • http://spavale.com/uploads/1/3/0/6/130640199/fudakiz.pdf
    • http://whatnourishesyoullc.com/uploads/1/3/0/7/130739885/b33a6f23b592.pdf
    • http://elitecakecreations.com/uploads/1/3/1/1/131163980/1176220.pdf
    • http://lovecentered.net/uploads/1/3/0/7/130775734/6263636.pdf
    • http://bilingualyellowpages.com/uploads/1/3/0/5/130538953/jixodamesez-nuzisovur-jivugojun.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_off00008a32.bin
39bb751ae46a1f7b70b6cba4737fb568a48d1312105a72a7be65bc9c71c4d6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A32 8792 bytes

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