Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d4d17384436f5e…

MALICIOUS

PDF

97.9 KB Created: 2021-03-15 06:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 55225b6940dd25749ca0b6dc5992e31e SHA-1: 56716c470aac70de3410b7ebd5bb5e03358cc49b SHA-256: d3d4d17384436f5ea4c9d006d4fa59a0b453ef7162c7a3c988255f4ac3617a23
134 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains or link farms, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm heuristic further supports this assessment. No scripts were extracted, but the document's structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://crophysi.ru/123?utm_term=erasmus+plus+programme+guide+2018 PDF link annotation
    • https://cdn.sqhk.co/tadeketoxab/mijECgd/champions_league_draw_simulator_round_of_8.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/FVqjdAD/forabovetubexoposirojab.pdfIn PDF document text
    • https://fimezerix.weebly.com/uploads/1/3/4/4/134478386/2a4eb79c753e68.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/ghNjehg/jolteon_moveset_shield.pdfIn PDF document text
    • https://cdn.sqhk.co/dizukenepu/jiRRFhh/airport_city_game_codes_list.pdfIn PDF document text
    • https://cdn.sqhk.co/tawumemikuva/k9hijbQ/approximation_for_sbi_po_2019.pdfIn PDF document text
    • http://tosufiloxosi.66ghz.com/42140945849.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/igihhBn/make_bucket_list_meaning.pdfIn PDF document text
    • https://jepukarebav.weebly.com/uploads/1/3/5/3/135321711/mifitixevi.pdfIn PDF document text
    • https://cdn.sqhk.co/wafavalufa/ic14hcT/fegefifaniburabosofuxufez.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/iiigVfp/zombie_survival_map_for_mcpe.pdfIn PDF document text
    • https://cdn.sqhk.co/xavipinav/Zheghjd/juxopazobete.pdfIn PDF document text
    • http://suzaxikuzexaw.66ghz.com/fudofodakotozun.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/e28deee9-72d2-4347-9103-8b6e76bfde8f/how_to_program_comcast_remote_for_new_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899cea05-fdff-48c9-9153-86c21c8bd417/how_to_use_brinkmann_propane_smoker.pdfIn PDF document text
    • http://deketinak.rf.gd/25903300160.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_9a3919a8842b4d75bb23f3220fc4c1e5.pdf?index=trueIn PDF document text
    • http://xasebor.rf.gd/clark_forklift_starter_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3438bee2-6c4d-4619-91cd-3a31bdb4a08e/raymond_nh_police_log_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e09e3b2a-814d-4de4-b097-7f094e87eea9/judesepo.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_186244c9be7b4fe1a4e3835061be9078.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 1656 bytes
SHA-256: c0c4de211e06b3cb8f46fe437f92fae3f8a2bc380fc627cb04741960ce7524b9
font_01_sfnt_off00013e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E86 5756 bytes
SHA-256: 4f0e268c430030f207c843fe110e9410fb5596e4ce49779687c343f28b336383
font_02_sfnt_off00015205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15205 11732 bytes
SHA-256: b9a3d3ec6e8db96ccbf0c378d59a2deda8c4e6ef5858aadb80dedfdffb722f54