Malicious PDF — malware analysis report

Static analysis result for SHA-256 436494369d3232bc…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 13:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3924a2ff8a9dd95080215945f6a7093a SHA-1: 3a628ca8bcffc5bca8e7ae4773f877a2806fa33f SHA-256: 436494369d3232bc82c3048652c2b2ca186eb120456c0585967979cca04e378b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document exhibits malicious characteristics, including a high ML classifier score and ClamAV detection as a phishing trojan. It employs a lure to trick users into executing commands via clipboard manipulation, suggesting an attempt to download and execute further payloads. Additionally, a callback phishing lure is present, consistent with social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://jts-electrical.co.uk/ckfinder/userfiles/files/78509863869.pdf In PDF document text
    • https://gkia.org/kingkong/userfiles/files/24844882494.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/693668873613563387dac8.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161428889ef101---26958521111.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/zizopiwenuvafidojidebafuj.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/zudovowamoxadisawuw.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/67142371451.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/44226252602.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/61860619199.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210907184745.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb360373f---71576864055.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/22961067614.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gixusimiruga.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/60361977856.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfdecc4424---54805484514.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/3469838335.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/22685919138.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/49528396313.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/jikidumilawifolirowelon.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/37521082177.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/nufategijatipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=amazon+fire+tv+apk+downloadPDF 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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 10776 bytes
SHA-256: 7263ee7a2d3965b24121a0e687a72f79b986a1352d1d9add3684d6493a273cf3
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 17628 bytes
SHA-256: c59a0e7dd0f16fdf792232edccac169c549f2f906560cc5c1b4ebcda2a61ba29
font_02_sfnt_off000118e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1