Malicious PDF — malware analysis report

Static analysis result for SHA-256 e828fb6dc1760f0b…

MALICIOUS

PDF

47.2 KB Created: 2020-04-04 10:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 36a7e9d2920098f1e23a3b7e9d908f04 SHA-1: d2a6189a3246f8a0f71bc88eb233c67863025754 SHA-256: e828fb6dc1760f0baa5e5775421c8f4351c983ab9d7a672ed2f711c91221e748
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to these external URLs, suggesting a link farm or redirection scheme. The primary attack pattern involves directing users to a multitude of potentially malicious or SEO-manipulated websites.

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://tarzanaapspanishtutoring.com/uploads/1/3/0/4/130477135/130477135.html#pol%C3%ADgono+de+ocho+lados+oct%C3%B3gono
    • http://mariyakarcelova.com/uploads/1/3/0/3/130323362/pejetukez.pdf
    • http://odyscontractingltd.com/uploads/1/3/1/4/131408970/tikesu_vezejiluwexatep_takefojuxamape_pudobif.pdf
    • http://newenglandchampionship.com/uploads/1/3/0/3/130323250/e51eda9d77081a.pdf
    • http://dominicbercier.com/uploads/1/3/0/5/130590461/3327b2dcc6c8.pdf
    • http://nickgaristopracticum.com/uploads/1/3/0/6/130620626/57b00e42.pdf
    • http://planchadoxpress.com/uploads/1/3/0/4/130488884/7305037.pdf
    • http://thepridemusic.com/uploads/1/3/0/6/130639721/nefetimugafuropidi.pdf
    • http://khayalamiproperties.com/uploads/1/3/1/4/131483454/pemijujabijunisa.pdf
    • http://loveofgifting.com/uploads/1/3/0/6/130622041/timakil_ropokabemebobon_kovir_jopobezatav.pdf
    • http://ftp2.bercgroup.com/uploads/1/3/1/0/131071145/4646898.pdf
    • http://itcouldbu.com/uploads/1/3/1/4/131453658/nexepowiwub.pdf
    • http://turningheadsdesign.com/uploads/1/3/0/2/130289387/0132312.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066eb.bin
27132c05e43b60a27b99d4338a701887bbb29290603dbd0cd52fde9ff4eab8c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66EB 10868 bytes
font_01_sfnt_off00008d2f.bin
86f1f731fce9cdd6c3ab8efdf6f62cc3d57fa3848b3917d70763454d668e6249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2F 2872 bytes
font_02_sfnt_off0000975c.bin
1487b004b073f9b6db0ff035e67151b06fb365f75b1613874944d86621b914dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x975C 16192 bytes

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