Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab98260971595c8…

MALICIOUS

PDF

81.4 KB Created: 2021-03-14 17:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 98ec8eee0c1b7950cca9cad104accdda SHA-1: d347fe8590c853f58a7656f2df8c53c39f741387 SHA-256: aab98260971595c8c67f4b7648b91edf2fe5988a834c34afaa3ce9beee7b2e63
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one primary URL pointing to zajinet.ru. The ClamAV detection and ML classifier strongly indicate maliciousness. The document's content and structure suggest it is designed to redirect users to potentially harmful websites, likely for SEO manipulation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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/award?keyword=worship+songs+chords+and+lyrics+pdf PDF link annotation
    • https://cdn.sqhk.co/fakujodi/degglih/39006126169.pdfIn PDF document text
    • https://cdn.sqhk.co/zosaremarebi/xgghfjd/jufoxisami.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/gGhjdpF/47777975802.pdfIn PDF document text
    • https://cdn.sqhk.co/rexazileka/ighgjic/pamiwoxomiviwoxabep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd58a049-e05f-46e1-87f6-e2dc7600f564/marqus_de_sade_livros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/272e0ceb-f368-4ee8-ab25-46298188dbff/91083144085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07bb1dee-7a4a-47c2-9e00-3a6740b3443a/dekivawo.pdfIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_72516f2ec79847478b58b5b3fc4e5e7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5162287e-39e8-49ad-8e82-5c690ada41f1/xiwavorosutituxom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952bb7bd-b951-40d0-b0f6-48fc1cfab1bf/forefomurawitupefatan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b44b5835-dc24-4617-a65a-722b50a4a714/vesefavarufakekukekapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d5a78ca-f056-41e0-a125-0da93ae0d011/zazel.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_10303b1baea447638db78cb3d88b0bba.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_35aaf3a4672c41648b3e55e28adf0eb8.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_4b141881fdf34fc58298a271a9a3bf38.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1c1d7d-69fd-46d1-bf0d-1c15c50e956c/35210602207.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_098f72384a6d4792904e5df7a0297e2f.pdf?index=trueIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_e84530c62a0246f7a6934f06aaa320e3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1236ae-44fd-4917-ab4a-bf0d0e7e7a29/rodanukipolobimutevex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/775a7e29-f462-4f74-964f-5531b7d0b38c/82494646212.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_26827dd0631d4fdb933a4b06a4b78010.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_aeca7f8d51124405969cb777113fe0dd.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_738de968bef2495e908e582b4daa979a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0868eadf-8e2b-4ef0-b31a-ad558df8a3da/wopuxije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a79910-d12a-452b-b6ff-9d7b4a8c2c13/13476702162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b8b7ac8-90f5-4833-a3c9-054d1e19f224/5_point_likert_scale_examples_likely.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347eae3c-5a5a-42bc-849c-079b9586698f/estudio_del_trabajo_traducir_a_ingles.pdfIn PDF document text
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_44f28836dfc140928935799415074582.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af38f79-54a1-4de1-95aa-d0ed37f80af0/what_happens_at_the_end_of_vampire_diaries_season_7_episode_19.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_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 5532 bytes
SHA-256: 988cc676e1a36470155beac7b5c100f20dc2140b587c0f274250e037653b14c7
font_01_sfnt_off0001128a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128A 10980 bytes
SHA-256: 1b914ea02fb66a09e34f0b7763cb4e3557a4a14ae46ab9b832fcd0093b0e1e4b

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