Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fafdeff151a83d…

MALICIOUS

PDF

74.7 KB Created: 2021-03-20 09:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c1b3ef027b89538702d97eb91b3a9d2a SHA-1: 243469ea2b7f13adef71a71050a0208745d77c07 SHA-256: e8fafdeff151a83d4b81bb0184edb5b39c0a41ed9fabb5128b54ff0dd7b46719
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious sites, likely related to the 'convert pdf to audio file' theme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=convert+pdf+to+audio+file+free+online PDF link annotation
    • http://test123test.xyz/lumafej3xejr.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/attack_on_titan_season_3_op_2.pdfIn PDF document text
    • http://natiral.space/fusionner_plusieurs_documents_en_15nv2b.pdfIn PDF document text
    • http://smotrikino.fun/83062862759k69tl.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/eAxiagj/subway_restaurants_menu_nutrition.pdfIn PDF document text
    • http://tublitalia.space/triangle_congruence_worksheet_answersc4n2f.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/ghhgdhe/lutamibutuxitakijubuv.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/cognitive_behavioral_therapy_treatment_plan_example.pdfIn PDF document text
    • http://moresukko.ru/wefegiridiziwezufamun3xdl.pdfIn PDF document text
    • http://insurancecarusa.com/family_tree_worksheet_freeqhfl8.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/c_programming_mcq_questions.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/Khi2hbC/fesanafetonigobadi.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/fogadamerope.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/aDgs6mu/xbox_one_headset_no_sound.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/89192a51-82e5-49c3-a241-ba9db7fa73af/simple_and_compound_interest_worksheets_grade_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e0e1bc-c265-4825-9306-d09fc3a4d05d/6587064917.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/18061087523.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_off0000e761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 4824 bytes
SHA-256: 9e8efd4b654067fcf246aa251fea6b3f59426f4bc7be1d0702ceb57d363393db
font_01_sfnt_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 11024 bytes
SHA-256: 40854b94902027267209dfaf25d5556ae816f0870523844d4682c8dfae4aaf5b

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