Malicious PDF — malware analysis report

Static analysis result for SHA-256 abddb8dd7bcccadb…

MALICIOUS

PDF

85.9 KB Created: 2021-03-20 14:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 57e851dd3b71c773630922020862499e SHA-1: 2ee910999079529fc6a30ec0d8ebe698d819e8c9 SHA-256: abddb8dd7bcccadbc344edd41b0e3948ec8719422a86f0e514e82328daed273f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a phishing or scam attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lead users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=naglaho+parang+bula+in+english In PDF document text
    • http://fudoviwil.mywebcommunity.org/how_do_i_enable_airprint_on_my_brother_printer.pdfIn PDF document text
    • http://latitekiwa.scienceontheweb.net/fevugikadipafur.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/vgakaib/guardian_tales_laura_diary_3.pdfIn PDF document text
    • http://linefesejewug.sportsontheweb.net/critical_care_unit.pdfIn PDF document text
    • https://zubikuzo.weebly.com/uploads/1/3/1/4/131453486/lukikezekomojoraga.pdfIn PDF document text
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/1745320.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/how_to_study_for_hesi_exit_exam_2019.pdfIn PDF document text
    • http://gojawufeki.getenjoyment.net/33834573594.pdfIn PDF document text
    • https://cdn.sqhk.co/bipozipo/ifZiinu/24278287895.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_e81adfe1cdec4691bc00c4e6bfdb89e0.pdf?index=trueIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_31f4d5a8e3ea4ef0b0e8947ab5842f10.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_bde65c1c7cf64a3e81f1c6fa2b4036e9.pdf?index=trueIn PDF document text
    • http://tiluxusimutine.atwebpages.com/what_size_tires_does_a_2009_chevy_malibu_have.pdfIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_58406ce81ad64b4b875c2a4419d959b9.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_bff9b2516332486bbc659121e402d3a9.pdf?index=trueIn PDF document text
    • https://72cee60b-533f-4fda-9f40-87b1bb6f0553.filesusr.com/ugd/590778_1caedd9066b24c15912500c1c4ed1052.pdf?index=trueIn PDF document text
    • http://jalebuvubo.myartsonline.com/bidetowusutibuvolulam.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_1c938fbc1643492fa355f19b4868910a.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 2900 bytes
SHA-256: 7b4a49995b7dd69d4afe5ee3eee77951727d25d484e62cc4016f8f5b91e0b297
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 5192 bytes
SHA-256: fd39eb8ba576b6cbf45a2d77181634eccffc479325bdc34074d56014c72e871c
font_02_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 11316 bytes
SHA-256: 239685ea3469fa8e86174a50693adee5240a66a40c0b044ae5e15abe55de7031
font_03_sfnt_off000134d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D6 16164 bytes
SHA-256: 3f70697d8cfd0b9becff5adcad726f9ffedcc5d773cc6f7abbcc82b2f8034994

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