Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef5683ef3257fcb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 07:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3817f39ae1e9215bb21fb58097a56dd SHA-1: a1c254496fc8ec749f2db32a2c0042e8633e877e SHA-256: eef5683ef3257fcb63cff9580f19430b16527511d278e657b0104a6d8bb92928
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting it functions as a link farm or phishing lure. The presence of external URI indicators and the 'link farm' heuristic strongly suggest the primary purpose is to redirect users to other sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/14979336456.pdf
    • http://dokturmice.com/ckfinder/userfiles/files/44923821602.pdf
    • https://aczv.fr/userfiles/file/8856326413.pdf
    • https://pharma-tools.pl/galeria/file/kizirotix.pdf
    • http://tythb.cn/uploadfile/files/546403935.pdf
    • https://ripedesign.com/app/webroot/files/fckeditor/file/jogefidaforeruzadu.pdf
    • http://v-lukomorie.com/uploader/files/xikerudeboli.pdf
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/ponozosikubun.pdf
    • http://avanti-kuhni.ru/upload/files/64550167545.pdf
    • http://goodfortune.hk/UpLoadFile/file///gowuxugaf.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/23622192959.pdf
    • http://ateliergermain.org/sites/default/files/file/silaja.pdf
    • https://bitree.ru/ckfinder/userfiles/files/sezajotasimaw.pdf
    • http://inwallendorf.de/userfiles/file/diginasidux.pdf
    • https://bczenekar.hu/files/file/wugopakagikomif.pdf
    • https://tideandtigers.com/ckfinder/userfiles/files/lurufo.pdf
    • http://soosanfix.com/upload/fckeditor/file/12209812703.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613382d127c66---janupijonafozunavefi.pdf
    • http://songdolandmarkcity.com/userfiles/file/27775474717.pdf
    • http://maasmartcity.com/userfiles/file/vamanej.pdf
    • http://dailyxedayhang.com/userfiles/files/lisafivaviwifebomo.pdf
    • https://lompatjauh.com/contents/files/84969811024.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=note+3+3g
    • 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_off0000d60c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD60C 16792 bytes
font_01_sfnt_off0000ee22.bin
c54de1957a1fadda71df9ff7ce62dfe9b1add4cd6c98790f70ae93e3b45822ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 9760 bytes
font_02_sfnt_off000103a4.bin
5634593b24402a14b2baba3914facf09c369787b12ce900b409b7eab0db6208b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 18384 bytes

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