Malicious PDF — malware analysis report

Static analysis result for SHA-256 751d7e77ea46a044…

MALICIOUS

PDF

87.1 KB Created: 2021-09-13 07:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b72d57b89343bd815f9891d4c21fa4f SHA-1: 0afc05415936345bc849792adc856afbf59c2849 SHA-256: 751d7e77ea46a044e0b936c33de7de6598228485d7f3619836d24a0a99dd8dd3
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. It contains numerous embedded URLs, many pointing to suspicious domains, and exhibits characteristics of a link farm. The presence of these links suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hmradiatoriai.lt/images/files/foloraxum.pdf In PDF document text
    • http://thienthaopc.com/upload/FCK/file/40994329787.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/ximeraxulemige.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/36743281225.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/tisaresabelusufetupawi.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/41576115275.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4e4581a8---39569007362.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/gizox.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/80016346771.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3f3f893ae938711c9339d6f00ed6b375/94817044570.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/52105952302.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/lovabulukudunu.pdfIn PDF document text
    • http://aromata.ru/upload/files/fagobafejilarozedil.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/97093745654.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/lixafasepesafos.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/balumoguza.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/lediluwoxowamudafuku.pdfIn PDF document text
    • http://adriennemason.com/assets/files/jedexerip.pdfIn PDF document text
    • http://greenglobepms.com/uploads/20254756685.pdfIn PDF document text
    • https://mikludava.lt/images/files/47389906567.pdfIn PDF document text
    • http://soles2walk.com/data/file/simivomabamekefifekafe.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/27232158395.pdfIn PDF document text
    • http://bamila.vn/luutru/files/70089776578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+music+videoPDF 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_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 10372 bytes
SHA-256: 9bc4f8e1afb3d04173e96f160d3aa0a94f1af2c40690b7fcaffc8b9e4b8fb912
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 17592 bytes
SHA-256: 4ab4030280196ffcd988e1af46a87d35231ef540d0c454cf8ab6e4c5ab1d4a94

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