Malicious PDF — malware analysis report

Static analysis result for SHA-256 a65dcd5ce2e1b153…

MALICIOUS

PDF

82.1 KB Created: 2021-05-02 17:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 333a4a4e11a509ca71c7065878b66409 SHA-1: 558a2f2694cd644061e4f3e784be7ad7cd4aa09f SHA-256: a65dcd5ce2e1b15380749fc224a07d8cf7a31c3e7a96b23961b6a1d3ecef4ef6
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=riello+burner+nozzle+sizes PDF link annotation
    • https://zifudaxoxatoj.weebly.com/uploads/1/3/5/3/135313713/4d5307e4b.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/dHZnjib/kb2475l_backhoe_price.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392439/normal_5ffcded74a086.pdfIn PDF document text
    • https://cdn.sqhk.co/bodorosuzuta/fAg8ggP/64783875154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_605475f1352c2.pdfIn PDF document text
    • http://gizesodawesiv.mywebcommunity.org/asphalt_mix_design_methods.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/hLS65Td/furious_train_sniper_2016_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530457/normal_6065f9941a40c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_6009218451a04.pdfIn PDF document text
    • https://gafepidata.weebly.com/uploads/1/3/0/7/130776025/6297755.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/suwisufafizin-gipapo.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/classe_angiospermae.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/fbc7f314-4f19-41e6-bda5-3c654a4f8bd7/ge_4_device_universal_remote_control_silver_code_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c784bcf-6be7-4b7f-a9c3-b9dc8771c000/43359625431.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/sony_hdr-sr11_live_streaming.pdfIn PDF document text
    • http://temodorofeg.atwebpages.com/describing_people_s_appearance_english_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46a20f64-82b3-44ac-8602-1cbe0f7930f8/how_to_get_adobe_acrobat_pro_dc_for_free.pdfIn PDF document text
    • http://popofisofol.myartsonline.com/why_my_dyson_loses_suction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b0911c-d0bf-469a-af1c-0b0098c0e1dd/65120452809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520678c1-b9c7-4d72-b052-06f62e5303f6/john_deere_l120_drive_belt_slipping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd828447-1845-4042-9897-f4193228fc0e/how_do_i_pay_a_parking_ticket_in_california.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 4664 bytes
SHA-256: 8053d3c759c09c461ab71f6fb542e17c71d87e75585ed4cf6e6aeaf07e2c6a14
font_01_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 10992 bytes
SHA-256: 9f6a8f5c12ad24f400315decb692acd926089257e542fb0b5e5430d23a48531f
font_02_sfnt_off000125ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 16132 bytes
SHA-256: 0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667