Malicious PDF — malware analysis report

Static analysis result for SHA-256 236c63387d58ca70…

MALICIOUS

PDF

88.7 KB Created: 2021-04-04 21:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e03e5b4d59b7e0b34e25a1c5191d75f9 SHA-1: 61d2f772056390eab2887e58b63d755e5d0b0e08 SHA-256: 236c63387d58ca70e5da9cd606a4710f1665306f016b2af5203056310b341224
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is jumiwimov.ru, which is likely used to redirect users to further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jumiwimov.ru/strik?utm_term=how+much+should+3+month+old+feed PDF link annotation
    • https://cdn.sqhk.co/lebudawojafi/didahiL/descargar_apk_de_clash_royale_pc.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/xoketusevawerav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_5fd9902fbfd7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_600303410f7c4.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/xuviwozi.pdfIn PDF document text
    • https://cdn.sqhk.co/tudenireso/h9EihKz/refadofiwaferolajunoxolo.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/EgchiCx/archero_co_op_code.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/IhjPIhj/8_ball_pool_hack_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/jcgjgeJ/bayside_farm_market_phone_number.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465709/normal_5fdf892c4e01c.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/183de11b-e098-4f30-861b-7ad236a9ea59/18751115891.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_e95d05243d2640c59c7bb2f9a883759b.pdf?index=trueIn PDF document text
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_31a019cb58c2443285c91ec3e040494d.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_6ec849d869ac4b12a3ce10645cea4ed2.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_65e24001f9f9491c90224963997124a2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b23807-1850-4c6a-886a-d2a32768a7d8/norcold_rv_refrigerator_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771a20fd-0fde-4b11-9def-b108add6ffef/how_can_you_tell_how_many_atoms_are_in_a_molecule.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_925c8e41aa6e4eeba8c9790bce6762bc.pdf?index=trueIn PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_2813c76098db4cdfb0aa22422f9b3d64.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_c827f8ec1776432ca9c3c2b297d1ea31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/207c0de3-5d91-468a-9760-2da277a75960/transitions_for_paragraphs_examples.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_5e609ed50e86422eac2855a54c26ba72.pdf?index=trueIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_2e96e4643ee24e06b20f8484224d2e40.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_7a420179bfdc4f278e9fa9dcc08db09b.pdf?index=trueIn 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_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 5004 bytes
SHA-256: 3d0f16bea3e3daa6b98d65e03f85fe8f6cdaf488831273af82f60991d4e6aabe
font_01_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 11204 bytes
SHA-256: 5a1feaad1fd3c33528e3a1ac8ec221c7906e5e28017ff41e9d090d01b132a172
font_02_sfnt_off00014507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14507 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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