Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a839368705e450…

MALICIOUS

PDF

86.8 KB Created: 2021-03-09 09:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d6b6186331b354479cefd9a1899bb53 SHA-1: 9a2935fbf9ccf61ac6ab63f310de15476ae00fa3 SHA-256: a3a839368705e4507ac511bc7f8fd04fcc9bdab94a9f5a0dd267c2bf234d9338
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a search result for 'bible vachanangal malayalam pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=bible+vachanangal+malayalam+pdf PDF link annotation
    • http://ketupepid.22web.org/61883555607.pdfIn PDF document text
    • http://bedojipekasel.22web.org/15845468580.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/werewolf_totems_white_wolf.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/88164722067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_99ed030dd3ef42c188ba2791ea53bbe7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavale/41641548175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97dd13e8-865b-4d8d-8090-e5e2a7a845a4/92454784489.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_423372b38a394a59aa3855abf886c5d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kujapomib/optiplex_7010_dual_graphics_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f1ca7d5-d734-44d7-88a1-90804d5c0600/the_boy_in_the_striped_pajamas_similarities_between_book_and_movie.pdfIn PDF document text
    • http://rukojipunuwupur.epizy.com/australian_ethical_super_pds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481736ad-0f49-4b51-b303-bed3145c377e/gta_v_3dm_crack_v4_download.pdfIn PDF document text
    • http://sudebavegubud.epizy.com/continuing_nursing_education_and_ana_scope_and_standards_of_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32a17ce-02a7-48e4-9620-5af5d30d35b1/ford_mustang_mach_e_interior_dimensions.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_c59332d8662b4f4283f093cc8911d74f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/coppelia_mazurka_sheet_music.pdfIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_b26912ef54634041898c7096634f32c5.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_6cedce04ac1b4ad18370799d9084268b.pdf?index=trueIn PDF document text
    • http://jatomije.rf.gd/allshare_play_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/allure_report_integration_maven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d249bea-03d8-471a-9a3a-17fb6822c52f/22482517455.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 5244 bytes
SHA-256: 93ebbcffc30f3b40c53902d56fd922dd26c18609e3553938e2e0b68fd88aa4b4
font_01_sfnt_off00011c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C57 10408 bytes
SHA-256: 118a35bb3ff0d6d7445aaf45b521e5acdd29784557b196439a5f9dc89b40dd69
font_02_sfnt_off00013ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF5 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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