Malicious PDF — malware analysis report

Static analysis result for SHA-256 505e41c820b416e2…

MALICIOUS

PDF

68.5 KB Created: 2021-09-13 06:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a5c65f74ceacbe55c990240832de01a SHA-1: 1f87c14153504b723730cd2a20efe4d843ce1ca1 SHA-256: 505e41c820b416e27a54e8ae08e213142f143f7bddb93280dc4cab702a514bbd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and is identified as a phishing lure by heuristics. The document's structure and size suggest it's an image-based lure designed to trick users into clicking external links. The embedded JavaScript likely facilitates the redirection or execution of malicious content, and numerous URLs were extracted, indicating a potential phishing campaign or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://wastran.ru/uplcv?utm_term=cheat+db+ppsspp+gold+android
    • https://bodymason.com/user_uploads/files/32903996219.pdf
    • https://zlatartopalovic.rs/files/fulita.pdf
    • http://bodybybodyology.com/ckfinder/userfiles/files/86086678941.pdf
    • https://siahotel.com/userfiles/files/17954682482.pdf
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/96061427100.pdf
    • https://epponline.com/mentorfinancial/page_images/file/42703730102.pdf
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/mojudagonupozevep.pdf
    • http://huarui-bio.com/upload/files/74623821691.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/56073056492.pdf
    • https://idroilektriki.gr/files/file/27016078403.pdf
    • http://goldartline.ua/userfiles/file/razopotopazorasododabegij.pdf
    • http://dietgame.net/admin/fckeditor/data/file/20210905195053.pdf
    • http://cn-junsheng.com/upload/file///202191101115871.pdf
    • http://superbarter.sk/media/file/75203029862.pdf
    • http://bagiez.com/userfiles/file/lutapofedexofizesi.pdf
    • https://atiksigorta.com/files/62632000052.pdf
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/67486111922.pdf
    • http://tianfonmm.com/d/files/zonulonog.pdf
    • http://nifaelectronics.com/userfiles/file/49195724642.pdf
    • https://foundryindia.org/userfiles/file/94112612271.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb78142601---38745639874.pdf
    • http://starinviter.com/ckimagefiles/3654554091.pdf
    • http://orthocarecentroortopedico.it/userfiles/files/bowigozisuwax.pdf
    • https://alkirbilaw.com/userfiles/files/buvijetesubagewibiwo.pdf
    • http://gmkms.net/upfile_editor/2021/files/rejipador.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/
    • 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_off0000b18f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB18F 16792 bytes
font_01_sfnt_off0000c9a1.bin
d2ee3b19b01d0ac3cd699257e6453c9b93917a0b335f3e971d007d333ceda13f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A1 13964 bytes
font_02_sfnt_off0000eb95.bin
8baf5f60c2de61bbb471b86dfa5ba0f466d100ca550710a5a774af6b03175713		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 10840 bytes

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