Malicious PDF — malware analysis report

Static analysis result for SHA-256 a124fef459bcca0f…

MALICIOUS

PDF

43.5 KB Created: 2020-04-05 10:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fdfbf6301fcd8dcd4cab2b5318606dd6 SHA-1: bb0f40fba26407712a7149fb7261008e4fbf7274 SHA-256: a124fef459bcca0f307496bf7d8a079cec82cbb7c281e25db143bee41bc80146
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 to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains the title 'Demostracion de propiedades de matrices inversas' and references to wkhtmltopdf, suggesting a potential lure. The primary attack pattern involves directing users to a link farm, likely for SEO poisoning or to distribute additional malicious payloads.

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://kevinlambert.net/uploads/1/3/0/5/130544448/130544448.html#demostracion+de+propiedades+de+matrices+inversas
    • http://stageleftperformingarts.com/uploads/1/3/0/8/130874015/dapivapumod_xodugomorugora_wixad.pdf
    • http://logisticsunitedinc.com/uploads/1/3/0/2/130289461/modivojobafoza.pdf
    • http://socalasta.voyagerwebsites.com/uploads/1/3/0/4/130476700/rarupatoguj_fusujuvukerege.pdf
    • http://sarahschepers.com/uploads/1/3/0/6/130604848/7224af5282.pdf
    • http://lockerbiedoggroomers.com/uploads/1/3/0/3/130379798/purapajupakatofog.pdf
    • http://drjohnlightfoot.com/uploads/1/3/1/3/131398219/xununez-sadagiw-vikegajas.pdf
    • http://homefitresults.com/uploads/1/3/1/0/131070196/179473.pdf
    • http://johntobinjr.com/uploads/1/3/0/8/130814347/lukutiworob-nakali.pdf
    • http://trepimeister.com/uploads/1/3/0/6/130621628/raziwuw.pdf
    • http://reachingtheworldforjesus.com/uploads/1/3/0/5/130542692/a0739072698.pdf
    • http://brittneylaterphoto.com/uploads/1/3/0/5/130550858/460460.pdf
    • http://asiatikaperu.com/uploads/1/3/0/6/130603832/305094.pdf
    • http://daqswingsandgrillla.com/uploads/1/3/0/5/130540085/7680590.pdf
    • http://clearspringspool.com/uploads/1/3/0/7/130738603/kagebozox_xozitataf_ronegusokum.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_off00007a4a.bin
9a2ef3572ec2b4c84542198b0a8b2d5cc894a878e8aef56ef097382ecf079752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A4A 10048 bytes

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