Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe82456bb648a9d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-31 12:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 994e3d5458940a5c27a1a1ae7be3b07d SHA-1: 2afe671f0fc7941f714945d336d37171a8991063 SHA-256: 3fe82456bb648a9d884cc39abb1b42a233a12b55249550ecc74cbca53d641a30
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL is https://botokaw.ru/award?keyword=les+ampli+operationnel+pdf, which is likely part of a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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/award?keyword=les+ampli+operationnel+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371005/normal_601cfaf889c37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_601b286c608ab.pdfIn PDF document text
    • http://maderajapodap.iblogger.org/wagemivilumutu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_5fedd1be69c06.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/bridesmaid_proposal_card.pdfIn PDF document text
    • https://lefitujeledezov.weebly.com/uploads/1/3/6/0/136028835/4eb4f.pdfIn PDF document text
    • https://wigikezidewuti.weebly.com/uploads/1/3/4/5/134578964/lepodip.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/tapovu_fizojokogar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_60171df0d7b89.pdfIn PDF document text
    • http://sakuravaju.iblogger.org/arquitectura_moderna_una_historia_desapasionada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_585b4efe8c3643308c97e84dba5c4baa.pdf?index=trueIn PDF document text
    • http://gorevifero.epizy.com/notification_email_format.pdfIn PDF document text
    • https://3cde87c3-25ab-478b-b58d-ba072f1c7540.filesusr.com/ugd/255d97_383d5dca42124f639d7cd078416829ed.pdf?index=trueIn PDF document text
    • http://luvetux.myartsonline.com/sociology_objective_questions_and_answers_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcaa4230-6ca2-419a-bc5f-c45e1bd70ef6/chord_coldplay_something_just_like_this_lyrics.pdfIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_912b312743224a80881773a8ce2b434d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8faee04-91dc-40bb-8078-f001ffb51f42/82054817199.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/how_much_does_an_associate_analyst_make.pdfIn PDF document text
    • http://betesemimototi.rf.gd/sorakoses.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/how_to_load_a_primo_water_dispenser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3674feeb-4af3-4c4a-a414-9ca6dadd6246/advanced_engineering_mathematics_by_erwin_kreyszig_flipkart.pdfIn PDF document text
    • http://xikebivulusures.rf.gd/free_menu_template_for_microsoft_word.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_0aa63ea81b194ff59bed07bf9b0bf043.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_63f99b05deeb4c2f8e5e70129419c96d.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_off0000ee5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 5128 bytes
SHA-256: cd96571eb88b9fe91caf8c71a3591a27eecc71f1fff7b0afd5f97def0333202a
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 11960 bytes
SHA-256: a9f76f4194772bb079b94694f8a206c0d5aa50b8984a43d177bdefc7a73b446c

Open this report in the interactive analyzer, or submit your own file for analysis.