Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af4db232f8421d6…

MALICIOUS

PDF

89.3 KB Created: 2021-04-04 19:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d6b42857d616d61b18fe06252a6e3e59 SHA-1: 981c9b0af3e9ce3e268de355c6ee33ae2ee5278a SHA-256: 2af4db232f8421d62f732f7a33f515a0a1934eac812e09c84734ca8b555bdad1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains multiple embedded URLs, with one specifically pointing to 'fokemale.ru' and a keyword suggesting a lure. The PDF structure also indicates it's part of a link farm on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/wix?keyword=letter+of+accommodation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384634/normal_606132bac715d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_6023d49ea2431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392660/normal_5fff3eb874fd9.pdfIn PDF document text
    • http://biomanua.website/cambridge_international_dictionary_of_english_bookzvnjd.pdfIn PDF document text
    • http://smeh-mif.space/breakup_party_hd_video_song_pagalworldcdd20.pdfIn PDF document text
    • https://cdn.sqhk.co/xejexeremiso/hfYfhjg/logepuritijejak.pdfIn PDF document text
    • https://cdn.sqhk.co/fivufotimad/vajdhfj/movies_free_app_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487663/normal_5fcb52911845c.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/bidieey/86714184970.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5fe6ce1ab8fb1.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hevv9Qt/4_pics_1_word_356_answer_6_letters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495860/normal_60535d0fa9489.pdfIn PDF document text
    • http://mofolaz.22web.org/adobe_reader_12_free_offline_installer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_602f295c8ad14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486550/normal_5fed176059eb0.pdfIn PDF document text
    • http://balonedud.iblogger.org/importance_of_cervical_cancer_screening.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373768/normal_5ffa31e8c6b18.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/ibJgehg/wiwijovigatugekerere.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zarezelokuka.rf.gd/equinox_columbus_circle_schedule.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_6e4a8e7bb1e34090bd1615d2fa89d4c2.pdf?index=trueIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_5e127775df8d4bbebf5375151d043720.pdf?index=trueIn PDF document text
    • http://kupikobu.epizy.com/21622491520.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_203763ac307a44f6822a8d6b714c0782.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_76ee7f27ea0545f68a4af6ab1c5b51f7.pdf?index=trueIn PDF document text
    • https://6e6ad6c0-90f2-4367-a025-4e24aeda1d0e.filesusr.com/ugd/c9b7fc_11d888a0f45743ecb0e551c920e18b47.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 4900 bytes
SHA-256: cb29fb9545dc654f8a8d4207729a8776df800107c696c928ae444564accf728e
font_01_sfnt_off0001318c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318C 11348 bytes
SHA-256: 76ee7606a15f0f84b17eb5c6bd3150a5fa9edbb51988a29c1ec7a19e6c0f51c5