Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d26bae02947e405…

MALICIOUS

PDF

74.5 KB Created: 2021-04-18 22:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5c5fa348bd3b16ad630db8953d26b820 SHA-1: 11b310a31a83565ead67041640a1b9b6f7a42326 SHA-256: 9d26bae02947e4059141ba9bf22869500189e3a3732f4e48810f71d2a8195322
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 0.9998

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+much+does+a+medium+sweet+potato+weigh+in+grams PDF link annotation
    • http://ilkertr.shop/how_to_register_uniden_dect_6.0_handsetya8yx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5fdee3a3c7c4b.pdfIn PDF document text
    • http://bilet-pdd.site/ishihara_colour_chartilgff.pdfIn PDF document text
    • http://help-business-media.com/bergeys_truck_centers_trenton8kl5i.pdfIn PDF document text
    • http://fionainthefield.org/present_simple_passive_exercises_with_answers1zlg6.pdfIn PDF document text
    • https://cdn.sqhk.co/jakofawesavo/Iohjajg/bilijexewuzekuruxilila.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/ii3gege/guardian_tales_guide_world_1-_4.pdfIn PDF document text
    • http://creditpm.com/machine_learning_with_python_tutorialspoint_download68ojw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378406/normal_5fc96cccb800a.pdfIn PDF document text
    • http://ketotreno.buzz/48489003455he7nc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489237/normal_5ff0e0ac37215.pdfIn PDF document text
    • http://bitcoins-profits.com/what_is_the_book_of_the_wars_of_the_lord_in_numbers_21l7td8.pdfIn PDF document text
    • http://unonatur.space/administracion_de_medicamentos_via_subcutanea_conceptol91hj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_792f699863b94a69a2e8e606f7da66ac.pdf?index=trueIn PDF document text
    • https://34fef40c-4934-4c56-b24d-59915ed92566.filesusr.com/ugd/806295_d3ac33de65cb4cd392ed10511b63dff6.pdf?index=trueIn PDF document text
    • https://5c3e38fa-bf2d-4cda-bfdc-19e9a39f2227.filesusr.com/ugd/b3ada4_954dfcc549cc4943a967c875149f8b00.pdf?index=trueIn PDF document text
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_73935d04fce0449fa6b45affae8a8e29.pdf?index=trueIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_65402ca1e4ef48deb8d6e7f053a74836.pdf?index=trueIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_bd49fdc1d79141c4b020b3155f085cba.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 5508 bytes
SHA-256: d62f13cf59d1b6e8b2d67562ee11a7c7f4af48e04b0f2317b782d0c909551bd0
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 11228 bytes
SHA-256: 8bf64f5b8852cfb67ce1deac600c6dce6a31f4a51442fc4d21fec23b19b0c314