Malicious PDF — malware analysis report

Static analysis result for SHA-256 2990952a9d87eda5…

MALICIOUS

PDF

73.0 KB Created: 2021-03-22 10:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c01e5e03e38dc80323e264d35d166e6 SHA-1: 1a94ded9af26ff27858f8852ef40663a0ad36f28 SHA-256: 2990952a9d87eda5b65883d6dd1d93ff790131f0d0c5ed41966df4ae59e219d7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=neca+manual+of+labor+units+2017
    • http://bimovixexena.scienceontheweb.net/79360707615.pdf
    • http://retapadu.medianewsonline.com/wonufumadoretovasexuzomi.pdf
    • http://dazinifuxevoji.22web.org/nutijepitaxarexupogo.pdf
    • http://tujijamutibe.sportsontheweb.net/24667212084.pdf
    • http://muwiduvepobuz.mygamesonline.org/tojizolejutalowupa.pdf
    • http://ruwexidokikisi.22web.org/inward_cargo_manifest_form.pdf
    • http://viniveba.mywebcommunity.org/dipotekajorave.pdf
    • https://tuzeninepag.weebly.com/uploads/1/3/2/8/132814935/7c53d2bfbe01.pdf
    • http://vurujupafowutox.mypressonline.com/27378138963.pdf
    • http://zemimumaloger.iblogger.org/dusonijugelojitularonu.pdf
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/2738740.pdf
    • http://gukapeb.iblogger.org/child_info_form.pdf
    • https://kapelivoxiri.weebly.com/uploads/1/3/4/0/134040857/5527501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/57992c7d-955b-4011-b2aa-92c249ceb931/fazilulatuj.pdf
    • http://suzujikuluvujov.rf.gd/82173262531.pdf
    • http://nizalag.rf.gd/destiny_2_last_wish_guided_game_beta.pdf
    • http://fofanab.epizy.com/formule_de_bisulfite_de_potassium.pdf
    • http://konojutusaxevik.rf.gd/95377357939.pdf
    • http://lukuvisebexa.epizy.com/customer_service_job_responsibilities_resume.pdf
    • https://uploads.strikinglycdn.com/files/c8b267d8-b0ca-4d74-a9f0-289c52c898a7/92102501796.pdf
    • http://waxodomopupu.epizy.com/emotional_intelligence_workbook_free.pdf
    • https://uploads.strikinglycdn.com/files/d593b4f6-df82-475d-a607-591953a6bb2f/12451280586.pdf
    • https://uploads.strikinglycdn.com/files/c4e76ca8-c85f-44ae-bdf2-a6073a3b08f5/arabic_alphabet_song_learn_with_safaa.pdf
    • https://uploads.strikinglycdn.com/files/b4915dd3-fb77-4dcc-8854-c2514f0067b9/zupimotewesaluk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6f.bin
c98360e29ee4a64cd2b77d9572178c195e628f5a691cc83e54412669800420a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6F 5544 bytes
font_01_sfnt_off0000f044.bin
5608edb9e29d3e0001b1bb5b6df36cf3c536f06a284a2fff584fbc04ce26e7dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10600 bytes

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