Malicious PDF — malware analysis report

Static analysis result for SHA-256 313f1b47fb1efff5…

MALICIOUS

PDF

80.6 KB Created: 2021-03-28 19:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 712cb06e5065f8cd352804bf50f494d0 SHA-1: 6e7982c997943e38505e6a9a3294f664e227b70f SHA-256: 313f1b47fb1efff5eb84322cba8617e4babe2404cf8831124a57db79a567258d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('vilenefex.ru' and 'urott-hu.com') that are likely part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Amelie comptine sheet music pdf'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/award?keyword=amelie+comptine+sheet+music+pdf PDF link annotation
    • http://urott-hu.com/texatudibumaruto6oji7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481985/normal_5fef02e0ccbe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_6054d8815b453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_601abd419dc25.pdfIn PDF document text
    • http://xuvaxujogilo.mygamesonline.org/liftmaster_elite_series_3800pld_garage_door_opener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_601bbf42cc694.pdfIn PDF document text
    • http://tradebot.space/bogewozevotefvqj2.pdfIn PDF document text
    • http://netewe8.xyz/jagatugawejevsrjah.pdfIn PDF document text
    • http://secureappeal.com/social_contract_theory_definitionlaoam.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/student_attendance_management_system.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_60248b61bfb2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454679/normal_5fe5e015797df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5fe6538ad89cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gefilodeza.myartsonline.com/62169452328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c95b958-4912-46d3-8b79-d88eb465c015/idea_data_analysis_software_free_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9276c4d-07cc-4ab9-8c93-d16dc735dfad/pc_study_bible_5_free_download_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15532531-a55f-4f12-b2bf-f506424a7929/sewoxenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edaf353-6406-424d-bf1d-25e388a5ddb4/97750687360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8daa49-ff02-4727-bb9f-62f3c85469a9/faguxod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effc23a7-7047-470e-bb94-0a21e9785523/37389558097.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 4960 bytes
SHA-256: 5757b2367b57e41a7ea990f60110ca6a1ab06b3bb95559ce89cd1af9b807ea5e
font_01_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 13812 bytes
SHA-256: cee101444c6f64acce72f1b79d6607509112b8e500b35044df36c4f28b58c45f
font_02_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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