Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d67ed849bfe37f…

MALICIOUS

PDF

79.7 KB Created: 2021-03-09 10:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5360caf971642b90b78f42aee4a5bcf4 SHA-1: c05b611929c6f8a1b1fa9140353317dd5e5b5cb9 SHA-256: 87d67ed849bfe37fe9f1add3f83cc7cd99cc8b4003b405a4f0510886b746f5bb
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the heuristic findings of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+to+qualify+for+cal+grant PDF link annotation
    • https://cdn.sqhk.co/buzomesil/agiPbgg/6729925405.pdfIn PDF document text
    • http://samo-katim.ru/15488144815mpsnc.pdfIn PDF document text
    • http://teachost.com/nigar904q7.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/hdDeq8t/graphic_design_software_name_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/hjj1Yjj/cat_war_2_unlimited_diamonds_apk.pdfIn PDF document text
    • http://optalpha.com/past_simple_and_present_perfect_exercises_with_answers4kh8h.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/zgfYggJ/street_basketball-_world_league_mod_apk.pdfIn PDF document text
    • http://babudategajuzul.iblogger.org/free_html5_boilerplate_web_development.pdfIn PDF document text
    • https://cdn.sqhk.co/mewixamok/jjmcOhi/jixufipomizajoku.pdfIn PDF document text
    • http://cardioactiveuficiale.site/ponto_de_encontro_student_activities_manualjfxdy.pdfIn PDF document text
    • https://cdn.sqhk.co/tedatekalo/906fiIS/beats_headphones_operating_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/Jhjgegi/pejosezudoxadid.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/c2705445-abc6-43b9-a664-41727feba426/is_kenmore_sewing_machine_385_low_shank.pdfIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_a1fff30d4d304fa08f6cc5c870a4eb64.pdf?index=trueIn PDF document text
    • http://fopaguduvogo.rf.gd/hub_bazaar_movie.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_aee1105b446441dfaa15c53a2480449e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f127e8-b30f-4556-9aec-519793058ec3/bafonap.pdfIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_1c3680ff6fa1455080dd9248d0b6c5ef.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_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 5152 bytes
SHA-256: f6546a4dd9bb1abb80d199e56a5ab4c6f75c920bfb661d3730eff1d8bb853e3c
font_01_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 10604 bytes
SHA-256: fa1a678087c18d304ebac58bad4ed5238c6aab85ec11b2274c497713e3a64cbf

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