Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d21337ad25c478…

MALICIOUS

PDF

57.0 KB Created: 2020-05-16 10:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f9fd4fe28da9d7223787e1cba222b96 SHA-1: 13418abcc36c319f6fbcf42dead67acc85c2f492 SHA-256: 09d21337ad25c478491768c8ccc8c4acc19fb4f870c6f8469c24af1d5445d95d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8294841-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8294841-0
  • 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://uibffworld.org/uploads/1/3/0/8/130813762/130813762.html#bdo+mobile+english+patch
    • http://amagier.com/uploads/1/3/1/4/131438888/23e4cac2768.pdf
    • http://altke.cn/uploads/1/3/0/2/130287878/lefovaliw.pdf
    • http://lifeintheshop.com/uploads/1/3/0/9/130968957/146579.pdf
    • http://farmerutilities.com/uploads/1/3/0/7/130776589/98ef8fb3.pdf
    • http://gridwize.com/uploads/1/3/0/5/130589241/pebexogunubilele.pdf
    • http://sgrahamdesign.com/uploads/1/3/0/3/130379367/zegitinewexologitipi.pdf
    • http://schittscreekapothecary.com/uploads/1/3/0/2/130272415/a29ae70a57e3d.pdf
    • http://haydeosgames.com/uploads/1/3/1/6/131636817/gezineza.pdf
    • http://exoticracingshocks.com/uploads/1/3/1/4/131406263/0eb3ff0f71.pdf
    • http://gregorydphillips.com/uploads/1/3/1/0/131070314/7ae8375f2.pdf
    • http://queenshouseofnailssalon.com/uploads/1/3/0/8/130874451/wimofotex.pdf
    • http://doudoudessin.com/uploads/1/3/0/3/130379777/9725527.pdf
    • http://alhavilla.com/uploads/1/3/0/5/130551788/8810956.pdf
    • http://amazondesk.net/uploads/1/3/1/4/131454222/8085457.pdf
    • http://justjimmusic.com/uploads/1/3/0/5/130590521/zaraguwit.pdf
    • http://iwdtimetochange.com/uploads/1/3/0/5/130539097/widupewil.pdf
    • http://redwoodcoastaccounting.com/uploads/1/3/0/5/130551179/tetugofuvanowa-morutu-tifolax-wejefiri.pdf
    • http://needavac.com/uploads/1/3/0/9/130970009/9330397.pdf
    • http://supersalesmentor.org/uploads/1/3/0/8/130874167/f507fa22e51ff.pdf
    • http://extremeautoshine.com/uploads/1/3/0/7/130740174/6880d1e.pdf
    • http://powerupyourproductivityday.com/uploads/1/3/0/7/130739711/tibixutojifub_tijar.pdf
    • http://velascopressurewashing.net/uploads/1/3/0/7/130738569/9e984.pdf
    • http://ecp-wi.com/uploads/1/3/0/2/130288486/waxesara.pdf
    • http://murfhoff.com/uploads/1/3/0/6/130621167/kuxanitu.pdf
    • http://ray-larsen.com/uploads/1/3/1/8/131871605/9e30977d1e84ab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007200.bin
ee2471b0cd7e74d28a7ceb767f3688463d451215d7a80186f7a36a21e167cb1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7200 12976 bytes
font_01_sfnt_off00009cd9.bin
a87a5311d2bcf3696af8e335c7bd2ac7aed4d70f710ee29f9925581650cdad13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CD9 10440 bytes
font_02_sfnt_off0000c117.bin
2ca46b65cc5cf04aee3d6680b7c1b80b722891b010ddaf4ced9479fe1d55e0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 16396 bytes

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