Malicious PDF — malware analysis report

Static analysis result for SHA-256 706649321df0f8ea…

MALICIOUS

PDF

86.8 KB Created: 2021-04-02 13:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a78e50666458522a9407f1099f71afad SHA-1: 04b5c763cedb1f9598209e2c7189b37e72273ee6 SHA-256: 706649321df0f8ea86c60b7a8bd0b4fe9b3b45c7d3fc51d2bd9e5173340c9d2c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to redirect users to phishing or malware sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document designed to lead users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://leonvi.ru/award?keyword=environment+vocabulary+esl+pdf PDF link annotation
    • http://mowukedova.mypressonline.com/amitriptyline_davis_plus.pdfIn PDF document text
    • http://ewop.space/skyrim_bodyslide_cbbe_tutorial5vtoz.pdfIn PDF document text
    • http://letxxnx.org/mathematics_general_knowledge_questions_and_answers4k9h0.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/canon_digital_rebel_xti_battery_charger.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://sosed.market/indian_navy_mr_syllabus_in_hindip2or3.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.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/ad729ffe-50f9-4b45-a7ee-2a4f40e33840/rewinaruzakekefapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8db2bb6a-b1ee-456f-a49c-d4c71cec0f16/99916541778.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/tabla_pulgadas_a_centimetros.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_71159edc319d473c8dddcadec34d92b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce13ee83-c5be-423d-a8e4-ce2b105bb683/how_to_reset_the_limit_switch_on_a_goodman_furnace.pdfIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_8f9e39bfeea444d0a3b4a6c24fe67aa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f57090-8d06-4493-9965-3fc04bdb70b1/laxazojed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b85031-be75-412f-b2d3-7c8520c56c1f/what_kind_of_dog_is_snowy_tintin.pdfIn PDF document text
    • https://620678a0-8f5b-407b-881a-8a96a128c1c4.filesusr.com/ugd/25b7a6_1ec2da22ccdf447e8b43fc227b961636.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_a155abec9e57410eacfc31f49990aa73.pdf?index=trueIn PDF document text
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_02bc9fb76c524d32bd0268d65348e358.pdf?index=trueIn PDF document text
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_1152cd69a98e4ac0ad2e0d5a959fda01.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_c53975ede5304a1ca006874f5b7cdce2.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_39ac767f35b3414d9c3fc960b632f61d.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_3d2b6a61956a47868d26771b6ba75643.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_5f40aaa97da141f992cded9d8b98ebb9.pdf?index=trueIn PDF document text
    • https://5902ff30-e651-486c-ac37-3e8383bfa78f.filesusr.com/ugd/f35da0_744b6c2248e94f20a0041ab37d06afd0.pdf?index=trueIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_8440962d59df493fbc8135e0c86b6c71.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11696 5560 bytes
SHA-256: ec9716d7b7fc436888108df3ffeb6c17510fc1364f2109261fd6caeeee6bcbe0
font_01_sfnt_off00012974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12974 10612 bytes
SHA-256: 3c1565e79b43464faeb38ac2f4f7ab0a57a834c298be3ca6e90359934ac8e428