Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8d63356dc4cd62…

MALICIOUS

PDF

84.6 KB Created: 2021-03-13 13:18:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9180180418aa2c91437e55c72c013a16 SHA-1: 20f1d8969785f76b79c4b7ecb134a4a922a1eb1d SHA-256: 9e8d63356dc4cd62bd63296a10441704f11df84df138b73b64f0d2ed293b1229
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous external URLs pointing to other PDF documents hosted on various platforms, including disposable ones. The primary URL, 'https://zajinet.ru/wix?keyword=nc+math+2+pacing+guide+2019', suggests a potential lure related to educational content, which is then used to redirect users to a network of other linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=nc+math+2+pacing+guide+2019 PDF link annotation
    • https://cdn.sqhk.co/raxulaxesob/jetBhcT/best_in_car_racing_camera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417325/normal_6011ec287c75b.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/jfjcxhj/freeway_ford_denver_service.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/hfMijig/dino_hunter_deadly_shores_pc_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5fd63954b85ce.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/PicPRgc/xibugabujofesekuwowupeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_60438bf426345.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/knmihif/miponaxozujasefiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5fed8194bff36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_60263a5c07e07.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_2496f91ab6814cbba7cc3501cb8ea8a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb031c91-88b5-494b-9809-4c8991c87c71/how_to_connect_alexa_to_cpi.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/certent_disclosure_management_user_guide.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_b974f55a003c44cc98805262ffa01b73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/23519824557.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/ikea_kitchen_planner_program.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/52378577554.pdfIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_fa1f20876b384cbb9849e192c77f7339.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bac4716-c283-494b-a0f4-0b0821566504/zowojugewetefopexudiz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 5632 bytes
SHA-256: 3704ed74103b12917f2f9c8b6d3626f7f35a510dd80de5df16c1b13b4723afd3
font_01_sfnt_off00011e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 11584 bytes
SHA-256: 46f3a80f37c4d320767536dcb4870666f1b9da67d0e3b29e44fc733f6122fa73

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