Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8afc6b2f7dd1f44…

MALICIOUS

PDF

94.3 KB Created: 2021-06-13 20:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4ef4172fea5cb18c65d268f3693931b7 SHA-1: af6e58f957098035a5d3714a50ade32840c71fce SHA-256: d8afc6b2f7dd1f4403386ceaf6e9d631bf42c00b8a7ae637e2d2a9ee75c361bc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links, with one prominent URL pointing to a potentially malicious site. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to external content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/pbw?utm_term=naruto+senki+mod+legendary+shinobi+war+v4+apk+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460461/normal_6066f66f1a9ae.pdfIn PDF document text
    • https://rusapaja.weebly.com/uploads/1/3/4/6/134617617/palanapodeba-kupivupuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_603c2c7c2f6e3.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/wagaxe.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/46752891-1cbb-4414-b4cb-9b443f51a88b/ridgid_16_gallon_shop_vac_hose_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf77a359-3978-4cf2-bbd6-bdc97d521990/jezidimetiwivupox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0833d7c4-6112-4f3c-b0d9-a566faa64acf/31880513969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49afde2f-2620-4b1d-bee6-a8d6158419a1/titobenofinobilodonuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cdedd56-d704-4e13-86d7-7c42ddb6b37c/97407359570.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/w/file/fetch/144548325/fonetebupope.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144602823/zowet.pdfIn PDF document text
    • http://buluwogot.pbworks.com/w/file/fetch/145030854/sams_choice_spiral_ham_cooking_directions.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144782400/how_do_you_fix_a_pressure_washer_unloader_valve.pdfIn PDF document text
    • http://wigonewakil.pbworks.com/f/hungry_shark_world_mod_apk_2020_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c0b3c6-93af-4c88-90f5-9bfcad921d70/how_to_wear_mask_properly_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6796ce4d-099e-46b8-88ee-d26e55b82a57/31833820458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/528fbec8-d304-4fa9-8a6c-8abb60ae98d9/20480418240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2c531f-c197-45a5-8d14-6cad1ebe550d/what_to_know_about_marketing_management.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 3332 bytes
SHA-256: 372c96746d3a773e9ebf85f5587c08fd417b279847d050259dfcc7a783573450
font_01_sfnt_off00010ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEB 5772 bytes
SHA-256: d12d75984a05892ae7155c2ab7ce0e80e80db2c871291c63cf78f350907c690c
font_02_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 11724 bytes
SHA-256: 9f06a50f94ebc83284284e6ca3878af27ba042b210e660301ab0c2fc77ccfc38
font_03_sfnt_off00014726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14726 16232 bytes
SHA-256: 0ccdf16121817b2e504adcfa192cfabdf55b79cc0dc7316969108a199de67e19
font_04_sfnt_off00015c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C81 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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