Malicious PDF — malware analysis report

Static analysis result for SHA-256 8268899bc78aa359…

MALICIOUS

PDF

90.4 KB Created: 2021-04-09 00:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 6568fa488d67eb289aad24fc13b0f96b SHA-1: e8ef90413cf6f62e28273b2af4450d8024b4beea SHA-256: 8268899bc78aa3598d08c1f364f74fd750af3d9364d1b1b0500e29fa528e18af
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful websites. The presence of external URIs and the overall structure indicate an attempt to lure users to malicious content, likely as part of a phishing campaign.

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=bible+story+about+the+blind+man+%2528john+9+1-12%2529 PDF link annotation
    • https://cdn.sqhk.co/fiseguvugele/aqvqmM7/86079284998.pdfIn PDF document text
    • https://cdn.sqhk.co/pojukitogex/bjfkghX/nisuvafekosifukexasefiriz.pdfIn PDF document text
    • https://cdn.sqhk.co/tumokufagu/biigchr/witcher_3_crafting_items_list.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/dKgimjj/kuzogumovu.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/aAMhgih/basigogozejiritim.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/vosimalume/vision_pro_8000_installers_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06a5e0f0-006f-4aaf-baf5-fd39e5c179ab/who_invented_homework_and_how_did_he_die.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c8b65d-770d-426d-a00e-c738758e6f96/a_12-month_insurance_policy_was_purchased_on_dec._1_for_3_600.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_623cc96fe33c48509525e0449e7a4a35.pdf?index=trueIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_9f3eca239c634170a282c0634896fc87.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_13a7ab7afe7e44f88e2f6c7decc02e85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d024603c-3c5f-4f0c-b67d-94c47644a56d/maytag_quiet_series_200_not_draining.pdfIn PDF document text
    • https://43e59f28-96d7-4988-bcd6-55bc25f76e69.filesusr.com/ugd/372bdc_3197a298b5fa4db6995929e726c2f8a2.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_c7f75a76eab4498cb43584eac34f6d26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/suxijawozogixal.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_60bb1aafc878469aa8d11d3ef5becfbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/73900d3e-68c7-49a4-b104-2448437afc09/zuvukukavuzamegovij.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_ffb2e16dc9cf400384933039f53e842a.pdf?index=trueIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_10ab1c82a4184770afb4e8f5774da58b.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_ff3a62f133ab4aefa5c975d722fa7bcf.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_472d7ff876204012a31fbe33ac496428.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/cuntos_tipos_de_sistemas_termodinmicos_existen.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_c7848af3ecb4481dbbafb8e47f41a38c.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_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 5960 bytes
SHA-256: 5f2a2359f7964616e8d8eb6761d21a736fc7364ee4e26ff623e33ea3608f5bbc
font_01_sfnt_off000137a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A0 10928 bytes
SHA-256: 0da12d156eb91bfcd6a58c1844b09d016564fc5fb78e5400d0050250508de85b