Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff281936c44d9591…

MALICIOUS

PDF

76.7 KB Created: 2021-09-19 01:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbf752401389e402a52b8f613fb5cf4b SHA-1: 4ecafcae749b5f4474ff47c3a488fa4206541806 SHA-256: ff281936c44d95911a283d89a878ad8a86929bf5addbbe0d508d5f9f9a9de439
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The file contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://isigakizima.net/img/tmp/file/fogaxuw.pdf
    • https://digicpictures.com/downloads/penimozimijugazazejuguvo.pdf
    • http://rayanchem.com/d/files/zemowolebizikixajenofunur.pdf
    • http://pyramidplaster.com/file_media/file_image/file/60347871145.pdf
    • http://imbirimbir.ru/files/90552761270.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e47c1b37f---xipukirugizanixinaxifajis.pdf
    • https://panama4d.com/contents/files/goparepomivusofatijasut.pdf
    • http://j-club.eu/userfiles/file/gizegamuzivo.pdf
    • https://growyourmoney.in/userfiles/files/lisupozirikexavaferara.pdf
    • http://queenart.kr/userData/board/file/jidewizivurabogeruruwa.pdf
    • http://yalcinsezer.com/upload/ckfinder/files/fisusaxila.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/1569159889.pdf
    • http://szerecsengyogyszertar.hu/editor_up/bebutifiwamumuwivale.pdf
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/38338868837.pdf
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/89739934286.pdf
    • http://cbstav.cz/file/xiwirotekazixetusawitazo.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/53892460991.pdf
    • http://www.coverseg.com/uploads/ckfinder/files/fuvofi.pdf
    • http://solarissoft.com/img/userfiles/files/28137260134.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/647287627.pdf
    • https://pacie.vn/web/uploads/files/65406448485.pdf
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/7238111397.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=tamagotchi+widget+android
    • 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_off0000c7ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CA 16792 bytes
font_01_sfnt_off0000dfdc.bin
93ddeb92998abc84673de877cbd779cd0ad48f45f650024464267877475f600a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 17376 bytes
font_02_sfnt_off00010d71.bin
ca6228f8e354ebf08aab4127da37ce6d771c83f7f87ecdda2cddf02fe8af640f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10652 bytes

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