Malicious PDF — malware analysis report

Static analysis result for SHA-256 237f2bd42152821d…

MALICIOUS

PDF

76.7 KB Created: 2021-03-29 16:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07d78821143e6cdc08425d568fea51f1 SHA-1: 724a4a4569bc2af575e4b38a0e455e6ff7347112 SHA-256: 237f2bd42152821d7dbdf15e65cc846daee1b6787b2e6331288d9df549cd8d5a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL points to a page with a keyword related to children's alphabet learning, suggesting a lure. ClamAV also detected this as a phishing trojan. While no scripts were directly extracted, the structure and heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=alfabet+po+angielsku+dla+dzieci+pdf
    • https://cdn.sqhk.co/kumipexa/jguciih/mukavimumafovobo.pdf
    • https://cdn.sqhk.co/guzupewad/RhGdejd/fawumuvapenufor.pdf
    • https://cdn.sqhk.co/noneniwetav/2jhhblU/nuzarebejogabidatiguwoz.pdf
    • https://cdn.sqhk.co/sovokeduseb/Nstoyic/43785431159.pdf
    • https://cdn.sqhk.co/fowurona/M8haDjb/68547980446.pdf
    • https://cdn.sqhk.co/xaselavub/c905Tjb/stay_alive_reprise_hamilton_fanart.pdf
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/a72a4c17f0f7a6.pdf
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/zamekoxab_figutefige_sinepagikotezo.pdf
    • http://lamakexo.scienceontheweb.net/baii_plus_financial_calculator.pdf
    • https://cdn.sqhk.co/guzunilepin/ij0vRbG/history_great_battles_medieval_pc.pdf
    • https://cdn.sqhk.co/kigakikijebo/hbhjXjc/madness_combat_hank.pdf
    • https://wimowago.weebly.com/uploads/1/3/0/7/130775393/tebewade.pdf
    • https://cdn.sqhk.co/rufosopufu/bahjgiO/quirk_craft_build_and_play_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_1059d0527be14eaa8def1c09ab4702f5.pdf?index=true
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_78b892e3a5094814b7597390900f1203.pdf?index=true
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_1ea53984203d479e82b68d70faa43e13.pdf?index=true
    • https://s3.amazonaws.com/gawabog/indiana_university_plagiarism_test_answers_2019_quizlet.pdf
    • https://s3.amazonaws.com/veledabejufi/limigesufurakiku.pdf
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_72cc79be29b440dd8a3c83d6954de586.pdf?index=true
    • https://s3.amazonaws.com/xidulumexi/vamojifimus.pdf
    • http://pojoviraxerojo.myartsonline.com/78559587933.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a0.bin
97a4de2607fe75fe6ddeb318d64d959b41f4bad74a7bc2a649a9013e995e6ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 5468 bytes
font_01_sfnt_off0000fc5f.bin
e29e8b57b48016ceba09beed95083fc0794a01a0fa0418d3f6138883d8985a8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 12476 bytes

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