Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74f329e8f3a1361…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 11:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02f0eb898f697b89be2a5b94589ed134 SHA-1: 78ce2897d439f6b2e5e2a1970d76bc6c3ba18a72 SHA-256: b74f329e8f3a1361dadab0d15829c573f20e40d925a39757505b5137d6c41910
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the true destination or distribute further malicious content. The presence of multiple distinct hosts and a high number of links suggests an attempt to evade detection and spread malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://lindendirect.com/ckfinder/userfiles/files/gidas.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/gejivigamidabazeja.pdf
    • http://thenikharvconsultancy.com/userfiles/file/najowoterupejozu.pdf
    • https://aradmissions.com/ci/userfiles/files/21692735564.pdf
    • http://seattlebestteriyaki.com/uploads/files/44611854146.pdf
    • http://yao-cheng.com/uploadfiles/20210915234608.pdf
    • http://duancanhotot.com/upload/files/ribevefozanuzanogepu.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/vozabozofizobepadapi.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/52192187153.pdf
    • http://fabriziocar.it/userfiles/files/gapizadanegagowivageluwe.pdf
    • https://dellrein.ru/content/file/sukibuwokedesuki.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3llk46gj247vqlu8iuch372jse/wiweregeve.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912060149626852.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/xevekatojowutanoviduk.pdf
    • http://aelma.com/sites/default/userfiles/file/jigudujowavolugiro.pdf
    • https://burstallconrad.com/editor_files/file/6944053549.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/3704635824.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/57657076863.pdf
    • http://cjmfgx.morefriendship.com/upload/files/28121606987.pdf
    • http://optikametuje.cz/userfiles/file/nepufomimu.pdf
    • http://miass.realxenon.ru/uploads/files/37148954572.pdf
    • http://rpsbchamber.org/editorData/file/mefefadizavumamoferol.pdf
    • https://ofly.om-digitalsolutions.cn/upload/files/79292116610.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=watch+love+in+time+online+free
    • 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_off0000d229.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 16792 bytes
font_01_sfnt_off0000ea40.bin
b55d89ec0029f9deabb188a5314b2ef883f78eb7dc5a66c914424afbd3b72509		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 10492 bytes
font_02_sfnt_off000101eb.bin
44ee382d5af537d61e91550030c37871077b4b164fc6f389e198e7e0ebbc34ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 17348 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.