Malicious PDF — malware analysis report

Static analysis result for SHA-256 894c7f5518b24318…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 15:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3296b9beb9d0e89c13e0a67790c2ecce SHA-1: c99abd7fdf13e1583820b6ebf8860fb55bd8d9d3 SHA-256: 894c7f5518b24318a4663ac6e00ef9db85bae9d1651ee6294781c9272a52011e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm. The ML classifier also flagged it as malicious. While no scripts were extracted, the structure and numerous external links suggest a malicious intent to redirect users, likely to a site hosting further malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://novelinternationalschool.com/ckfinder/userfiles/files/jigamubokegebew.pdf In PDF document text
    • https://ibshospitals.com/userfiles/file/kaferakosotubupune.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/niwewawiw.pdfIn PDF document text
    • http://workontext.ru/media/file/vupuneje.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/lezafaxavuzo.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/64978023110.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/23544426051.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/dozoposobunowiwokuzepem.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/xiseliminibib.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4b0066a4015abd12887ae1ca9a2b1d39/9914636061.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/80071314143.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/nisada.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/kunamegujavelino.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/julof.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/79490933142.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/10388974634.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/41539334680.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/98182752189.pdfIn PDF document text
    • http://deltools.com/userfiles/file/48395792987.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc3b4e3284---wosobakumefakej.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/firaxuranegesikoxes.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/31042119441.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/58109992157.pdfIn PDF document text
    • https://bnovum.hu/downloads/63203416560.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/50993974997.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/79050609075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hambre+de+hombre+libro+pdf+descargarPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 19536 bytes
SHA-256: c18bd16b8b2f5b16a76d9759ab1597aa80119494355e9d3101c05aa9d9da6039
font_01_sfnt_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 10996 bytes
SHA-256: 8a2e66ca92961090764a05bab3e065b50edb0679027cf2cdbe4cf95effe4d53b
font_02_sfnt_off0001250f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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