Malicious PDF — malware analysis report

Static analysis result for SHA-256 8447ebbbd35bfc70…

MALICIOUS

PDF

87.6 KB Created: 2021-04-26 20:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2ed129eeb01aebe20362f5a6548a5137 SHA-1: 17f905c9c8ab722d486315d90fd2bced7ac5d207 SHA-256: 8447ebbbd35bfc70c2697b901833c2bb27d4791c5a7b7ad0772e550e6a42c522
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and a link farm heuristic confirms the document's purpose is to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=difference+between+virus+bacteria+fungi+and+parasites PDF link annotation
    • http://7gusevshop.website/vilavuoytmb.pdfIn PDF document text
    • http://ladyso.ru/416630510200c02g.pdfIn PDF document text
    • http://urolog.xyz/dremel_flex_shaft_inner_cable_replacement6sdth.pdfIn PDF document text
    • https://cdn.sqhk.co/jusigexovoz/25zdjhd/62234485025.pdfIn PDF document text
    • http://rastet-malysh.ru/diagnostico_de_enfermeria_en_trombosis_venosa_profunda6e6q5.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/d2JtjbL/phone_clean_antivirus_booster_master_cleaner_applock.pdfIn PDF document text
    • http://istlan.fun/macrocephaly-_capillary_malformation_syndrome_symptomsehp4f.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/4e6a3344204.pdfIn PDF document text
    • https://ramaxudefe.weebly.com/uploads/1/3/4/0/134042793/6911507.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoreve/hG8D3gh/temple_horse_ride_fun_running_game.pdfIn PDF document text
    • https://cdn.sqhk.co/fufitefan/8idBhbj/vavesume.pdfIn PDF document text
    • https://vufobuvi.weebly.com/uploads/1/3/1/1/131163959/cbcb74801e281.pdfIn PDF document text
    • https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/4522603.pdfIn PDF document text
    • http://discout.online/where_can_you_donate_used_toys_near_meczguw.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/ad61e4ce07fa60d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pidufozu/where_can_i_buy_corian_countertops.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/metal_gear_solid_5_special_edition_ps4.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/86616469937.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/14349350277.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/phonics_books_free.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_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 5580 bytes
SHA-256: 4c42a1024b761705edd967664e7650777b8e28ec97133888149ca675fdba8f22
font_01_sfnt_off00012c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C42 10828 bytes
SHA-256: 21f46c1c7360bc80997ac9bf384e469fc5642f34994124c7a0ddb03de6f2f5a5

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