Malicious PDF — malware analysis report

Static analysis result for SHA-256 5935040414482daf…

MALICIOUS

PDF

80.8 KB Created: 2021-03-13 16:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d430fa1d89b95376b5425e2a1b6b319c SHA-1: 9c4fed6480238b2dd0665e4ea5b8e4f4e281ef47 SHA-256: 5935040414482daf95e6fd66bcd55f7fbed6ca8bd7ab0dee93ff54d3d50b2a23
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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/123?utm_term=double+entry+bookkeeping+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450338/normal_603714145fd54.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff0c864e4cd4.pdfIn PDF document text
    • http://latuha.com/xemivizoloaddeb.pdfIn PDF document text
    • https://cdn.sqhk.co/gevagedubop/avvgdqt/24235488075.pdfIn PDF document text
    • http://obuv-kozha.ru/sharp_split_ac_remote_control_manual2g1uc.pdfIn PDF document text
    • https://cdn.sqhk.co/subetudagoli/iodiaii/recorder_app_iphone_free.pdfIn PDF document text
    • https://cdn.sqhk.co/girolivudafo/iHiaji2/earn_to_die_1_unblocked_66.pdfIn PDF document text
    • http://gatorama.fun/ledawefesatoz77f2l.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/tokarixawabo7au.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/hidjjiG/10011868287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_601e5a4332dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401692/normal_6042ddefb6f27.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/bSZrEjd/terraforming_mars_expansions_review.pdfIn PDF document text
    • http://taygerr.com/81612950106bs2py.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/geHsvij/fifepukutijuvuxonosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_6017ad7c55503.pdfIn PDF document text
    • https://cdn.sqhk.co/dawafawux/ZijjchQ/tripp_trapp_newborn_set_review.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/aKYYiNu/ruromiparekujidam.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/c85ba06a-03c2-4add-b5f2-b35a2fb2e39c/how_to_increase_speed_drills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee3f6b1-62f6-4bc0-a3ce-801d508c8ebf/the_school_for_good_and_evil_movie_due_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1185131e-e687-41f6-b10a-d5ddf082234d/how_do_you_make_popcorn_in_a_nostalgia_popcorn_maker.pdfIn PDF document text
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_2fd4c7aef25442958facb62d61b6ad5d.pdf?index=trueIn PDF document text
    • https://4c6480a9-ccec-4c20-853c-cc48681c44ad.filesusr.com/ugd/935adc_6fdbebe30d4e4a4d9a1e5011af2e220a.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_87f4eda487ba46c4a3d47b243c322334.pdf?index=trueIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_b5d1a3244d89460f84dc1aff3c0f5ed1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf46ad36-dacb-4e76-849d-c3ee89b0d6af/2476851039.pdfIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_89a2d0fef3e145adb25988ddab88512e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7715c40-b610-49c4-bfec-188a578fb147/breville_compact_convection_smart_toaster_oven_review.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_off0000f0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C3 5372 bytes
SHA-256: 557ccbc5f14f60ee904f76587b8d0d22bcd381d22a022b0f3cc750274dc87be8
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 10680 bytes
SHA-256: ea504cf5f6c9ac9dfed50b4e4373f231c56fd58b818d4e55567d4caa37ccc77d
font_02_sfnt_off00012751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12751 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3