Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd56ae4864f31abc…

MALICIOUS

PDF

69.9 KB Created: 2021-09-11 20:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8483b8a11eb6b46db8b6d87806aa6bcc SHA-1: 3ec1d3f754d823659b14e3de5d3c718ff63c5bbc SHA-256: cd56ae4864f31abc45a64cc0d2c6cbaefae030e5cc8c597f47ee03f446f67c4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm directing users to numerous external PDF files. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://konikanarrowfab.com/ckfinder/userfiles/files/47914020772.pdf
    • http://katyababash.com/images/uploads/file/talarejimabokazuxawibipu.pdf
    • http://newbusan.net/FileData/ckfinder/files/20210911_F5193DE2BFBD6959.pdf
    • http://hkwwta.org/userfiles/89837966832.pdf
    • http://psn-monolit.ru/img_file/files/91357396668.pdf
    • https://duel.pl/userfiles/file/zidugewezigexaleninov.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52109462671.pdf
    • https://sapporopools.com/contents/files/rusaz.pdf
    • http://cka-shiba.com/ckfinder/userfiles/files/74583964139.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/5619351154.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7fec2bc7---pudokixulavikimojepuzijo.pdf
    • http://tfh-filter.hu/_user/file/28348765471.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/gonojube.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/71686122433.pdf
    • http://zawodydrwali.pl/app/webroot/userfiles/file/sulazigi.pdf
    • http://bona-agra.pl/Upload/file/mijesosorufukatul.pdf
    • http://britishcytology.org.uk/ckfinder/userfiles/files/51647669225.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/tezatikalowe.pdf
    • https://matrixx.lu/images/13177175659.pdf
    • http://holidayservicemarsala.it/userfiles/files/banepozosupatewobabo.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210911_C9D0437B019E3539.pdf
    • http://pixel-pro.ru/upload/file/rosirelibudozuwoduwoxeto.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad5a08c2c---57886696904.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=free+build+code+fortnite
    • 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_off0000b384.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB384 16792 bytes
font_01_sfnt_off0000cb96.bin
8276fc5dda5a3abc165a16a5768564e81d0d3b1840268a1de8452956f95e712f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB96 15432 bytes
font_02_sfnt_off0000f22b.bin
8d264fd83032091705f995d9e14a4512297c0fad61d48370c997844c1d394bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22B 10356 bytes

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