Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7e2d3c09832723…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 10:10:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 959f1aac30fefc1ce4abe1d6d0a355ef SHA-1: a02c03845f0ce9726d9a679958e5d12e9a0ef0a5 SHA-256: 3c7e2d3c098327239ea432dace97bc14f889e2c87395a6c5135f0c79a1c3806a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. Although no scripts were extracted, the PDF structure and numerous external URIs point towards a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/aws?utm_term=where+the+wild+things+are+max+costume+ideas PDF link annotation
    • https://nogusuxewi.weebly.com/uploads/1/3/1/4/131438155/bizugorajek_bifefonu_wubex.pdfIn PDF document text
    • http://nojavit.22web.org/dexasudi.pdfIn PDF document text
    • https://vuguwawu.weebly.com/uploads/1/3/0/7/130776175/senasagojebuti-logutafir-gapopasize-tibapiv.pdfIn PDF document text
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/disogofepilojef.pdfIn PDF document text
    • http://lusaxesa.iblogger.org/lumepelewavinupi.pdfIn PDF document text
    • http://raxajifiwovoj.iblogger.org/simple_bookkeeping_template_uk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davafegi.epizy.com/lepovukapusoxasel.pdfIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_e13fb072320540b1a613eb5fc14fc0ec.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_1ee78931596340e2be1331eafadfd175.pdf?index=trueIn PDF document text
    • http://pisasegobure.epizy.com/will_there_be_a_warrior_cats_movie_in_2019.pdfIn PDF document text
    • http://gesuzutegusovid.epizy.com/kayle_rework_guide.pdfIn PDF document text
    • http://rinejifivazori.epizy.com/cephaelis_ipecacuanha.pdfIn PDF document text
    • http://fozelaw.epizy.com/business_report_baton_rouge.pdfIn PDF document text
    • http://didabatok.epizy.com/90616669519.pdfIn PDF document text
    • https://8d537faf-e869-4ed9-a29f-988560fab1dc.filesusr.com/ugd/0cce51_00e72c97b0e646269b0321127450dae3.pdf?index=trueIn PDF document text
    • http://relurifiluxel.epizy.com/team_fight_tactics_items_cheat_sheet_scarra.pdfIn PDF document text
    • http://jedovimesize.epizy.com/fosojatumakuluzemuguvoweb.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_3f2558ce5ff44be1af3b1fbdda9488f4.pdf?index=trueIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_35f99d839e164afcb0c69e0429986de7.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_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 5524 bytes
SHA-256: 1c42b09b3d5b6fa69058add3d48b2c44f24173f213c3605c6078a45f01187e8a
font_01_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10892 bytes
SHA-256: 2c32fc42a632661bc051e203f828351a8c0fc4f24ebfd04e56177d66011caa76

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