Malicious PDF — malware analysis report

Static analysis result for SHA-256 a205423539e4733f…

MALICIOUS

PDF

72.1 KB Created: 2021-05-13 14:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c2d7fee452da04c2a18451cfc332e77 SHA-1: e6d8e5686c06db4269bf48f36b073d6769864f9f SHA-256: a205423539e4733fa4331fd7ef04ab49e94e7c618c1be77e2cd4ac5a03de9078
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=periodo+historico+del+modo+de+produccion+primitivo PDF link annotation
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/fimozom.pdfIn PDF document text
    • https://binamakizixevuj.weebly.com/uploads/1/3/2/8/132814618/nakumegizigi_sevefikoxipiseg_wisifojatolod_vevumagitojol.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/nufuvekip-kejesoz-wujoxusona-bawinotebelepi.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/visarujaparoki-volog.pdfIn PDF document text
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/4eb4afd6d384084.pdfIn PDF document text
    • https://wopinifem.weebly.com/uploads/1/3/4/8/134884590/fovenebigonazum.pdfIn PDF document text
    • https://wikojenuvovada.weebly.com/uploads/1/3/4/2/134266286/jenijewozuli_soxis.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/38401128563.pdfIn PDF document text
    • http://piriveva.scienceontheweb.net/bhagavad_gita_700_slokas_in_telugu.pdfIn PDF document text
    • http://negodebozebe.iblogger.org/animal_farm_audiobook_chapter_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_8e284afc02ae439baf5ad866d22dba53.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_42f043463c6a4b718fcbf4748e50db43.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_0736b1b73fdb4acebd2fd43499894b65.pdf?index=trueIn PDF document text
    • http://peruroz.onlinewebshop.net/breaking_into_wall_street_400_questions.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_fc4d6aef5fd341afa420ea8e3134dc95.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_fe1ed456f13149d78de33b13daea007f.pdf?index=trueIn PDF document text
    • http://tobegunobomu.rf.gd/what_is_the_role_of_supervising_social_worker.pdfIn PDF document text
    • http://zejuruk.rf.gd/elphelt_rev_2_guide.pdfIn PDF document text
    • http://temitugefowe.epizy.com/curriculum_vitae_template_word_online.pdfIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_7b1e98545b0747cca69fdafd7aa319a1.pdf?index=trueIn PDF document text
    • http://molumazorok.rf.gd/50181515862.pdfIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_0e0cfbb6ffc64dca82e2450b868954b9.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_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 5164 bytes
SHA-256: bcbbae811e4aa68706f98e14698a7ed628c3fbd6e73672743a27a60f2c1523d9
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 11588 bytes
SHA-256: b20e609664b78957565b1e87cfa5480738558f18dff9c507d3d34dee4a916c01