Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ed019ec137b310…

MALICIOUS

PDF

85.6 KB Created: 2021-03-29 09:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1760176bfbae598ec57358699d532df5 SHA-1: 90c5c17eb5a0777906cea25450d8f91ec3a3ef44 SHA-256: d3ed019ec137b31098f8aaa4e6a1d4aafaf4c0be74a891e1ff06e48d1e58723c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=how+to+block+knitting+without+mats PDF link annotation
    • https://fexagire.weebly.com/uploads/1/3/0/7/130775556/paninosofilij.pdfIn PDF document text
    • http://tobezoxalag.22web.org/origami_dragonfly_instructions.pdfIn PDF document text
    • https://lufigukinuma.weebly.com/uploads/1/3/2/6/132680864/9763043.pdfIn PDF document text
    • http://hotita.space/kewazolavulousyk3.pdfIn PDF document text
    • http://kkkirrreeee.space/85672825903quy0g.pdfIn PDF document text
    • https://rokipidofavum.weebly.com/uploads/1/3/4/0/134042790/kopixavetulakadinad.pdfIn PDF document text
    • http://xtw2.club/battleship_game_hackxxjre.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/4307190.pdfIn PDF document text
    • http://sy0n.icu/introduction_to_automata_theory_languages_and_computation_solutions_for_chapter_4i5y2q.pdfIn PDF document text
    • https://bivajeliju.weebly.com/uploads/1/3/5/9/135978375/dakilupijiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tomosuromiv.epizy.com/60553869506.pdfIn PDF document text
    • http://wixesazu.epizy.com/tujorakageleta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ba5e6e-68bd-42f4-a3c4-1c92570978a1/go_movie_no_doubt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94233d4e-f050-4506-9f07-430678e25ea8/which_of_the_following_is_not_a_phase_of_mitosis.pdfIn PDF document text
    • http://zetamox.epizy.com/powerpoint_free_template_medical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825bad81-367b-4a30-b621-adc9f4ba11a9/what_does_calling_a_bird_of_prey_from_the_east_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65400a0f-c0b9-4a60-a508-ba19cf57a4d6/patalupepex.pdfIn PDF document text
    • http://zuzojep.rf.gd/29631777895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d70a75f-0da8-494b-a48a-3248a03995fa/crock-pot_express_pressure_cooker_csc051_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6067382-6837-4ca6-9cb5-666f26617fdd/71059731947.pdfIn PDF document text
    • http://dileginaduke.epizy.com/icefields_parkway_driving_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8ce723-a8e1-4e66-b184-a7edd20f211b/lezipepowexolimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ef8562-90be-445b-8078-8f75554c73f2/parental_stressor_scale_neonatal_intensive_care_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66998f6a-db2a-450b-a935-5ceb201cf6eb/how_to_calculate_overnights_for_child_support.pdfIn PDF document text
    • http://pawolukexuw.epizy.com/belevujosadabazuru.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 5376 bytes
SHA-256: 15c55703c0a361ab7b5f25162095a3dc2839f7cf7a73655b30bd9ccd25e7eef8
font_01_sfnt_off00012172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 11584 bytes
SHA-256: 43c2fbe08e043923705039009a9cd2df88ee56004527a6e4d9ef18145ab23e9b

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