Malicious PDF — malware analysis report

Static analysis result for SHA-256 623e5dcd280abc97…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 23:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10196ded56e132d31e543c6c22c1fa28 SHA-1: 2485f1d356d31cc77298cb7d6c8bad68d3ec41f0 SHA-256: 623e5dcd280abc971a17c2c080590fd3db5e28c874429d0585fb6b268f12d2f2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a callback lure, suggesting an attempt to trick users into calling a fraudulent number. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c76cd113940cdbc801b8de0841cef560/tebux.pdf In PDF document text
    • https://andhimazhai.com/images/files/22712852237.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/a1da92b36f7b6b0443e4e10738a275ba/wasimomejojimorawi.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/mowowisupovinegipu.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tipavuvokego.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ragil.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/88557936410.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/fefoluxuroxovel.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/33140016243.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/4550720557.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/genotijowitifavux.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/jaxelometufunaxebux.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090315130191.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/15044785556.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xuvupereraruvazadupug.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/26541640491.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/fipegoxuxejifoxagolovi.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/88531821435.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/vewolirabonar.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/21088576525.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/56312878737.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/daxuvinu.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/51501445517.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/61538360400.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/22980866253.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/pebanorununiraboxofet.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/21049997836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=township+mod+apk+android+1PDF link annotation
    • 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 10576 bytes
SHA-256: 539293e0a1ddcdba2c47878fc89d65151a80ee2da084c6f4e391f8e8b25b6d15
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 17728 bytes
SHA-256: 16ca149dc3ecc3d3d6934f0237c485cc1a4e9c659403bb7a09a07f4cac5d0c87
font_02_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1