Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b1d2775358df89…

MALICIOUS

PDF

78.5 KB Created: 2021-06-09 10:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: aa12d253df7be0d2e54e4631a40d9eac SHA-1: 9c84e8fbd981285066701a5660f71c836624f5c8 SHA-256: 55b1d2775358df896f7e83f7ce6130d2e9d9aed4a3f215c75d1e4a2c6588bffe
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/pbw?utm_term=download+more+life+album+zip PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407664/normal_60bba986ddbe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_602a286e678cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_601d931703f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378853/normal_5fd8931c075ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_604776c98ade4.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4385435/normal_60b0a1b43c96d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5ff2133e7d71b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_602ca22286b2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_6040c27f50246.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/d0e188e9-182c-4d29-973d-d1d835e9e442/how_much_is_wedgwood_pottery_worth.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/what_is_the_3rd_season_of_tokyo_ghoul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced11180-0168-4026-aa60-27c957f817de/english_speaking_activities_for_intermediate_students.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/w/file/fetch/144538281/what_is_hyperconjugation_with_example.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/diploma_electronics_and_communication_engineering_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48982c2f-42ac-48d8-b76d-4e7923893553/kenwood_ts-440s_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64b4e3e2-04e7-40e9-9834-6ba2ea28f042/kedog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/866ed5eb-f444-4983-9510-162e10689b9f/xatex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd7f841-6fc1-41df-8962-3ebc20aa9491/what_degree_do_you_need_to_be_an_operations_manager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30a2e09f-8db5-468c-a1dd-304c8a61c5c7/how_to_balance_your_yin_and_yang_energy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0a9867-ddee-4e65-971e-4209fe2ba1df/english_speaking_worksheets_for_adults.pdfIn PDF document text
    • http://wezenibafasi.pbworks.com/w/file/fetch/144632571/ozark_trail_instant_tent_8_person_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f230d53-1383-4bed-9321-244f29562a80/kukixev.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144692397/78275944946.pdfIn PDF document text
    • http://goxuluk.pbworks.com/f/formula_for_average_acceleration_in_physics.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144718677/65247156942.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144420819/56326735250.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144501645/how_to_print_a_piece_of_paper.pdfIn PDF document text
    • http://mitamugukojo.pbworks.com/w/file/fetch/144927915/percy_jackson_and_the_battle_of_the_labyrinth_read_online.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_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 5292 bytes
SHA-256: 75b5da48bebca88bb85c1c48cf0f44a2f18e7f796d3f6cc1d3c77f0171853b3f
font_01_sfnt_off0001042c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 11380 bytes
SHA-256: 14787f8d6a00f7df4f52439345aca5f8e06b7d2b3fb23add05913fba1b287e39

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