Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b26f548ef00bf9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 19:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2d5dea5d241d2240674fdcce619a489b SHA-1: 96d2f13f9e3e0edc8c64b8750951acd832924d62 SHA-256: a2b26f548ef00bf9382312789354908ec7946d3068387112c9bd9c1551907f62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of embedded JavaScript, though not fully detailed, suggests potential for further malicious actions like phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=how+to+restore+missing+apps+on+android PDF link annotation
    • https://retake.dk/ckfinder/userfiles/files/vemazud.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/93458050558.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/nuzumenilunov.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/36ia9j415vesla7ua0f9hmitt5/jabet.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/siwuzikumoxo.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/bafavusadotep.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/40948706534.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/49863460993.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/vinuninimegoxuvefelo.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/66998362673.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/vawazajapad.pdfIn PDF document text
    • http://domario.ru/userfiles/file/71507829752.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/65385263720.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/senapakipe.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/19719070983.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/vegagoxisasexedo.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/91335081158.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/xivopo.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/15820432393.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/89162381426.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/34123028977.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/muwazivu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/419f077e7f91a7d83799d9f47e79a826/95002060891.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/16585092575.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/4419852374.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nodexulifu.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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 10768 bytes
SHA-256: f3df8bd902822978361981fdec59802498037256563a9ec26e23a8c205feb44b
font_01_sfnt_off0000cda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 17672 bytes
SHA-256: d84b05148ab5d6371d399de231b44dfd59bb3af9da5114cc377ea551a06ea13f