Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb20e20ba57e3147…

MALICIOUS

PDF

86.6 KB Created: 2021-05-06 00:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7bc7f84b90bb6601838161b567a0175e SHA-1: 981e56b05c7563d5c67e4d12440fc3beb81a6aaa SHA-256: bb20e20ba57e3147ba0f7392f06ce3f712baa153f6827eac0214ed615b5a459e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, and one primary URL that appears to be part of a link farm designed to drive traffic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=how+to+solve+properties+of+rational+exponents PDF link annotation
    • http://tifiwijewek.iblogger.org/the_last_lecture_chapter_5_quotes.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://uploads.strikinglycdn.com/files/b54ccc21-02c7-48c8-b6c4-fe1dc186d44f/how_to_find_the_average_velocity_of_a_particle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83c5a9fa-546b-47e7-8b59-4fffaf47e021/85390232686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9d01a9a-562b-489c-ae70-e2196fe58e05/45672087878.pdfIn PDF document text
    • http://zekubegem.epizy.com/latest_hollywood_movies_2019_released.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_ddfc6cd33bf642ed85d378e1bab78dbf.pdf?index=trueIn PDF document text
    • http://mopezit.epizy.com/equations_and_inequalities_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63091d14-371a-4d52-90f5-72dd27e35290/qpets_automatic_pet_feeder_troubleshooting.pdfIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_07be61efbaad4c1498a64f528d6f45fd.pdf?index=trueIn PDF document text
    • https://7a512b58-7189-4bc4-8343-f643fa9054c9.filesusr.com/ugd/1e52da_a292b70ec017415097270ab05b8f40c9.pdf?index=trueIn PDF document text
    • http://wekujugom.epizy.com/cover_letter_format_for_job_application_template.pdfIn PDF document text
    • http://benigef.rf.gd/86601921070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60bd1ae0-7c68-4d58-9353-860b841921fa/sports_illustrated_swimsuit_models_2020_names.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_6dee2227574c4025a0a75eb14d1b5c99.pdf?index=trueIn PDF document text
    • https://ad323f3e-245e-4e3c-8b16-de91fefec063.filesusr.com/ugd/5ea691_92f6cf7efc9e4adcae4f28b53aece2d1.pdf?index=trueIn PDF document text
    • http://vovijez.epizy.com/electronics_workbench.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_c35c3c1cf6614419875f6bf96d695132.pdf?index=trueIn PDF document text
    • https://c0cead0d-5248-483d-940e-95cc3acd9bde.filesusr.com/ugd/20d83a_6cb9f3e1c5f14cdfacd25071a9ae9a4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e2ce4a-ab32-46b2-a252-2022a85c57f7/what_is_a_3_bank_battery_charger.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_ee49af642df044d8a13becdb880ba38a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 4864 bytes
SHA-256: 6703611987e132e8da6efc5eba096af4894834ce9958f8200be5102a196e968e
font_01_sfnt_off00011672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 11284 bytes
SHA-256: 141d71b9b121371a83a106711e005d1d6926e08bcb73d8693a766b5cb8ca3042
font_02_sfnt_off00013cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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