Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ca483d808caac4…

MALICIOUS

PDF

84.7 KB Created: 2021-04-18 20:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cc944bf4cfc7821bd5bc506f8ed67872 SHA-1: 5913cdfb491d332cc247f2a5455c2b2fb45edd12 SHA-256: 79ca483d808caac4c6094f09888422ef3c84dce4fe664502a906e181121dd144
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the link farm heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=are+adjustable+mattress+bases+worth+it PDF link annotation
    • http://jepenufi.getenjoyment.net/nozumawovuwuso.pdfIn PDF document text
    • https://lekofubazag.weebly.com/uploads/1/3/1/8/131872104/eab91a55.pdfIn PDF document text
    • https://cdn.sqhk.co/jawezumate/jgj5gjJ/cessna_172_checklist_template.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/WjbK5hd/theater_resume_template_free.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/what_is_the_difference_between_paganism_and_christianity_in_beowulf.pdfIn PDF document text
    • http://nuxelafim.iblogger.org/63554750419.pdfIn PDF document text
    • https://polokerukoxabuv.weebly.com/uploads/1/3/4/4/134456912/dbf5d830f22d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_6023d7c55a13e.pdfIn PDF document text
    • https://mulikejigezom.weebly.com/uploads/1/3/5/3/135351375/3470311.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/jiihwS4/darkest_dungeon_gameplay_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/lamidipeke/gic5AqK/69136593243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464525/normal_60191e60d5a82.pdfIn PDF document text
    • http://fixebojamofi.iblogger.org/xijufurepibananezemo.pdfIn PDF document text
    • http://bulepozobagepud.mygamesonline.org/basic_granny_square_crochet_pattern_uk.pdfIn PDF document text
    • https://vuzigalami.weebly.com/uploads/1/3/5/9/135960382/6552653.pdfIn PDF document text
    • http://suzolovopu.iblogger.org/60024228146.pdfIn PDF document text
    • https://cdn.sqhk.co/kajemuwasutu/gehco1V/27978249477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwuwigo.rf.gd/diccionario_ingles_espaol_oxford_escolar.pdfIn PDF document text
    • http://serinuzosazojup.epizy.com/jikevofasewodapinuk.pdfIn PDF document text
    • http://fotiworoz.epizy.com/80053622547.pdfIn PDF document text
    • http://kebowikosu.epizy.com/nadamawolujodanukiziga.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7F 5364 bytes
SHA-256: e66428caf21651e1c0805fbdf2fbcb20ad3410bab48ece6fde53090b1dbe5e19
font_01_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 11520 bytes
SHA-256: 66ddb789f137fa0983ab3b5219884fc620577dcee8a0ac28758b79c3f916d72e

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