Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd69edb85ddd5ba7…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 18:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ee31954e713a1511e168f4b9ff8d0bc SHA-1: bdfc86e8f7e6af0955ffaee321049a28e7cecfbd SHA-256: fd69edb85ddd5ba784bf87ec28e17e2998eb7deff9042efb753f88f386e708f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=mech+wars+mod+apk PDF link annotation
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/meguwafu.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/gufopudif.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/39179293229.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901100121846975.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/51079533481.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/lomejuwuwinapigomerog.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16143c5208dcba---mezepabafadokumimesup.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/aqtg3550bl8plib01tkj6hrjc3/jozupanafo.pdfIn PDF document text
    • http://dfanchem.com/upload/files/tuvokutawokapolazonetex.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/64830978132.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/zosonowopabadixetipevano.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/guviwexinesosokagivugikup.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/fadumeligegukeb.pdfIn PDF document text
    • http://travellerisland.com/files/72030188045.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/98141390837.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210907192436.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/vanofebugazu.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/4780629004.pdfIn PDF document text
    • https://olterus.com/contents/files/punavefiwotogapaj.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/86142530602.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_off0000b8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A3 17808 bytes
SHA-256: f2e1be06b7372c156130ea5b72afefa0b619a25c7035dccbe3f413778eba638d
font_01_sfnt_off0000e6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 10608 bytes
SHA-256: c46555059e11db22ce01cebe35f41755834ebdbc3f43153d41a2aebb12d05d41

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