Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee6651f8de71955…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 04:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5fa19e171ee96bd731db214ab71b737 SHA-1: 0860c3d949a59b0da61e83fd26469b75eb5ca2b9 SHA-256: 9ee6651f8de71955e09ecdd162a485136f01662e1f711e4da6e6cc152e80296a
126 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malicious redirection scheme. The PDF structure and embedded URLs indicate it is likely used as a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://drafthe.ru/uplcv?utm_term=sg+mahjong+app+android
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/bigarakuwikabolaw.pdf
    • https://evpersoneli.net/ev-personeli/file/86882207886.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/43754122140.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/24682008363.pdf
    • http://e-hematologica.com/users/file/zixatapidugapuj.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/96917903980.pdf
    • https://alakharia.com/public_html/userfiles/file/fepubebixegujuwekomofura.pdf
    • http://zygzak.eu/foto_dane/wysiwyg/File/zifexuxebusitutet.pdf
    • http://modellszerviz.hu/userfiles/file/sitavomekalasubejo.pdf
    • http://status-go.net/gfx/userfiles/files/lesedodotabofepowetizi.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/jisogamewuwup.pdf
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/18683617853.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/wosegup.pdf
    • http://happy-land.hu/editor_up/nuzukubi.pdf
    • http://aalzkj.love-mrt.com/upload/files/9799157191.pdf
    • http://honeystraw.com/uploadfiles/file/17094354241.pdf
    • http://liveisagenix.com/ckfinder/userfiles/files/50570562994.pdf
    • http://snft.ro/media/file/pageledibanin.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430e0691343---34244777277.pdf
    • https://adikkeempat.com/contents/files/navotanujif.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d51c387949---fisibixa.pdf
    • http://thaimassageboy.com/ckfinder/userfiles/files/11050529285.pdf
    • http://www.jfac.kr/ckfinder/userfiles/files/22596649057.pdf
    • http://hak-al.com/resimler/files/49710972427.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_off0000dbf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF5 16792 bytes
font_01_sfnt_off0000f40c.bin
9282cce99d4d72b15b03ef56d509dcdcdfad1de1e4c2850217c8c246c2fd6335		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 10600 bytes
font_02_sfnt_off00010bbe.bin
735b2ecfbebf9aaa2bc9b8ed535d51072167c2bf5f4e3ee4f49a4e534f299599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBE 17168 bytes

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