Malicious PDF — malware analysis report

Static analysis result for SHA-256 0675cf886d307ec6…

MALICIOUS

PDF

77.3 KB Created: 2021-03-12 09:51:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: aa876570fc7b6c38378cebc8b79e1797 SHA-1: 2b3cd58e7fd538907b6c3471099d6dbe1e445a3e SHA-256: 0675cf886d307ec648ec7c717a469bc8da6e008e043f90a27084faaafd846973
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous external URLs, many of which are on disposable hosting. One of the embedded URIs, 'https://vilenefex.ru/strik?utm_term=why+is+my+sharp+alarm+clock+blinking', is a primary indicator of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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/strik?utm_term=why+is+my+sharp+alarm+clock+blinking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470835/normal_602a06edf1958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_6042e6b1f3d42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378379/normal_6001ba62e76ef.pdfIn PDF document text
    • http://lovechat24.club/best_free_sound_enhancer_app_for_android5f0a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383160/normal_5ff564632be27.pdfIn PDF document text
    • http://korecos.ru/how_to_turn_off_airplane_mode_on_doro_phone04u3s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_603884a17751a.pdfIn PDF document text
    • http://jojazinex.mygamesonline.org/durofezat.pdfIn PDF document text
    • http://habirovradik.ru/mosebemomusoblk7h.pdfIn PDF document text
    • http://russianstravel.ru/6475173405jjbny.pdfIn PDF document text
    • http://copyrightshelpcenter.com/15783608367qcepv.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/one_touch_ultra_2_battery_instructions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_600704c6e3173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449622/normal_5ffdaf3f01ff5.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
    • https://uploads.strikinglycdn.com/files/387edf5c-3974-49d8-8410-c41c622c51c7/zituko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02aa4099-3a19-4eb1-9772-3718bece3924/how_to_pair_plantronics_edge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac480c1-6524-4564-8ebd-54cac02dc463/what_does_a_creative_services_manager_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d66c642-d9e9-47a2-b7bf-3bf944d135b8/katawa_shoujo_route_map.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/pentair_pool_pump_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee8703d7-8828-43ca-8f5e-76d8b91541cd/mini_dv_tape_transfer_service.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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 5256 bytes
SHA-256: 18e68f5a85cbbd489262477a8c7652066d15eb65f389f95b8cdba49657c0e5db
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 11012 bytes
SHA-256: 7b7dbd26bd93ae878c7d4919546f0e69ded6e957d8459fa68e54129f6beb7aff
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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