Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d2adc168dee6dd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 01:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f86d0b3485108208825c34c25ecfbb9 SHA-1: 32b0aedd1160afc0147d10ef049f2ff8476b2b81 SHA-256: c3d2adc168dee6dd63eb4115e7d12a481a0a5ae1cb4a6d13e291e96da91cb065
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=how+do+you+unblock+someone+on+facebook+for+android PDF link annotation
    • http://luijkzonwering.nl/image/file/35392706986.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/77491964361.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/dawujibajenemelivobo.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/75495575188.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/a313d69df3be88545dec15770da32e74/zubejeligitukaxekugitejop.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///rasasitevodojenefa.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/wuvevuxapexina.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/15788300895.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/96155921954.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/rawipunot.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/95248165219.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/34316458907.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/luvobexafow.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/59408201482.pdfIn PDF document text
    • https://blogsma.com/files/92352008457.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gaxagamenisajapametid.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/26441206524.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/madulavoripizezi.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/libegifefasukef.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/08e0272754cfc0fa3c926c3ef32a7d06/55381176299.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/26697520272.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC513 16460 bytes
SHA-256: f717730701e793e87216d06cafcb97ca7731c4b0ee21f38c1146d809b78c7c6e
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 11064 bytes
SHA-256: 12b59c3fc084e56e6b8b3475a5b5d63346bb80263e2486fcf1989c4986a75499

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