Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4951393981cb07b…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 15:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fbfa4a06ea98777a6d6d158140b5322 SHA-1: 2371600a2d55a39e2cebdbbd40b90dd0f97aa140 SHA-256: d4951393981cb07bc74c31b69a6ff1f28afbd203e8693986b9f7e0b29eb5f8b5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a high number of embedded URLs, many of which point to suspicious domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of a QR code lure further suggests an attempt to trick users into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ozkayalartrans.com/userfiles/file/tufivivitufopur.pdf In PDF document text
    • http://kleiberit.ru/files/file/runow.pdfIn PDF document text
    • http://metapolar.hu/tmp/kepasok.pdfIn PDF document text
    • https://ismart99.net/upload/files/5087983083.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/8799818523.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/wujifofikut.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/6103224170.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/wazupuxuravudoratug.pdfIn PDF document text
    • http://philboyd.com/35473063830.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/50796702266.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/77849577066.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/17855293071.pdfIn PDF document text
    • http://atek-ent.com/upload/file/jixitovuleregefekaniro.pdfIn PDF document text
    • http://domplus.su/userfiles/files/7014711372.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/249972674.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137a468c3089---xalamonofimatogadubudi.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/pokufofa.pdfIn PDF document text
    • https://servicepapik.ro/files/68726085190.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/45903368609.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210906_B154E0960BA353E7.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/34918396390.pdfIn PDF document text
    • http://yejida.com/userfiles/file/zapozudifolamokevilu.pdfIn PDF document text
    • http://unibox.lv/files/text/42133513818.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/64962959207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+cast+of+a+good+day+to+die+hardPDF 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_off0000ce6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6F 17104 bytes
SHA-256: 7211c47c023d44929c3c2fc529613eaad97fffd2b9966b6057ad40706ce64389
font_01_sfnt_off0000faf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 10684 bytes
SHA-256: 929354eb3d4a981de1e3a295f643bc9c2565674faa26a52588c3c1d0a261fa66
font_02_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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