Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abd2b87c0a6401a…

MALICIOUS

PDF

152.8 KB Created: 2021-09-18 20:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0382c34246bbc423a38fb73eaf2731eb SHA-1: f09bf4a74fd2a9ca56e3fdb0058462065ca971fc SHA-256: 4abd2b87c0a6401adfc4421018d929e972a25a0ec99daa3aebd6c9f5bec7e7c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external domains, many of which are associated with disposable hosting or are used for redirecting to PDF files. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://cructi.ru/uplcv?utm_term=sandstone+seamless+texture PDF link annotation
    • http://ceomit.com/fckupload/file/degebanimobarusulupimu.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/nuxabasubisevulizibodi.pdfIn PDF document text
    • http://www.centralperdana.com/file/6036765905.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/dekuzar.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/guteludesifoji.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/51458040574.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/kidaniwa.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/tevaxekamilebiki.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/82834664034.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/rafobupoxu.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/ziset.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/nuwosefikuvapakerifo.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/sazejefeveduvuneri.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/jekelur.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/finurazozibi.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/befevolifibimudul.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/fivonij.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/kibofavedabipiw.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7b26854dc3e185d07f32fe0fa96ba487/buwumovesoxinimefizoj.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/a4r2ilpun27mq20lscnnidksq1/91898427517.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/49118782772.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/jowufarojovukedoj.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_off0001f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F803 17472 bytes
SHA-256: 0599a972285160f865b30a82b4dbd5a87d791c86cf0938a0450301bda69a6e6c
font_01_sfnt_off00022534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D4B 10592 bytes
SHA-256: c184386737a7918700d6f617c2cd182d4f52c9bc8338ecd8671f7670d7e57e62

Open this report in the interactive analyzer, or submit your own file for analysis.