Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb04a9945f7db9fa…

MALICIOUS

PDF

73.0 KB Created: 2021-09-13 04:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97cbd45a8978bfa6c5006a1cc627b212 SHA-1: 286a4fe9a4df60a9703e413ca06fc10818b50d28 SHA-256: cb04a9945f7db9faeae885712f3648c3ef829a721b02819fb9b33d3d40280d9b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of 'cmd.com' in the document text, along with multiple external URIs, indicates an attempt to execute commands or redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://drafthe.ru/uplcv?utm_term=vidmix+movie+app PDF link annotation
    • http://www.patriarca-batiment.com/ressource/site-image/files/girefivimi.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/pigizupa.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/zisakutidebifivelulivut.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/zogesatezuvidesozexakage.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/82754137244.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/dajure.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/92332963546.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/81542029435.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/75425057103.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81577827669.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/12022752050.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/feramosobupuwipopoz.pdfIn PDF document text
    • http://qdcmd.com/data/files/pabujujofekalenuv.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/27394346031.pdfIn PDF document text
    • http://kahasat.cz/data/file/16779783219.pdfIn macro / runtime command snippet
    • http://delve-cr.com/uploads/kapogumowugojemugoto.pdfIn macro / runtime command snippet
    • https://ap-qatar.com/userfiles/files/zijorusagopizob.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/57019803700.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/96573960165.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/jilovilizo.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/gexezamo.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cde604d50---xedutojepojubopiluw.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/kixapat.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/duxelumoriduperevumutipu.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210906152945-birerub.pdfIn PDF document text
    • http://www.rpv-dracIn macro / runtime command snippet
    • 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_off0000bc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC67 10176 bytes
SHA-256: ba0153390f8ef51ccb0cd76e98ee6034104616b200dde9766b919dc9ba464822
font_01_sfnt_off0000d32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 16944 bytes
SHA-256: 0e4bf5dc433ed1cdf006365d6620c7a573eb369371e53800b95fb6d681f83d0c