Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c59d4ce14efeb07…

MALICIOUS

PDF

77.1 KB Created: 2021-04-01 19:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ca771b87e2ce1d29ef7ca5544e042bbe SHA-1: b37481f0541d20691b6ec92082e182a05d3be885 SHA-256: 9c59d4ce14efeb075611ffcd2700573e18f9717f93cfeaaf5e2dfaafa8bc5f21
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to guitar chords, which is likely a lure to disguise the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/aws?utm_term=lead+me+to+the+cross+guitar+chords+easy PDF link annotation
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/renomo.pdfIn PDF document text
    • https://dewofawofuzujo.weebly.com/uploads/1/3/0/7/130775987/9234842.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/unitypoint_urgent_care_altoona_hours.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/87091511820.pdfIn PDF document text
    • https://cdn.sqhk.co/zamikukodef/ECfRjc0/avatar_creator_app_android.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/9744159.pdfIn PDF document text
    • https://cdn.sqhk.co/tememukafosu/ggWd4je/54756212518.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/geOmN8i/29974468762.pdfIn PDF document text
    • https://wenutezow.weebly.com/uploads/1/3/5/4/135400756/zibozix_falojed_soribenakazap_katitafisodu.pdfIn PDF document text
    • http://tometifo.getenjoyment.net/68160764907.pdfIn PDF document text
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/8912366.pdfIn PDF document text
    • http://viziziziv.mywebcommunity.org/wibefajanulesopowumo.pdfIn PDF document text
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/4a64386.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/runur.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/qOl0ggJ/ultimate_epic_battle_simulator_game_online.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://s3.amazonaws.com/wolawatin/arm_cortex-_a8_technical_reference_manual.pdfIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_c49debb28a6840df9436829fcf6c6fe5.pdf?index=trueIn PDF document text
    • https://af6bd0e1-9fb2-4c52-b6e5-df6188d17e94.filesusr.com/ugd/771d18_e905e8f785ac462ea34146dff4e06619.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_1603cf258d6b417099fde03ea223edbf.pdf?index=trueIn PDF document text
    • http://rufapapufogap.onlinewebshop.net/fegipafike.pdfIn PDF document text
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_3f330223e31f45159341ee0bbcfce71d.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_6ca93adf558f4224aa643485a0a8d679.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/32280501549.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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 5140 bytes
SHA-256: 9308c3507056fac0c092a47149d8b5d50b1d3bccbfc53d651123cce777b7f608
font_01_sfnt_off0000f1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BC 10972 bytes
SHA-256: 490615d122958d8c1b353ee26c6ff611ee9327eab81667b981c12ca5a094d67b
font_02_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176