Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e17114f98042129…

MALICIOUS

PDF

86.8 KB Created: 2021-04-16 19:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5f05389be0481106891387cd3722c5e2 SHA-1: de73160ceec70dc80365a00796b5689b6b07f964 SHA-256: 8e17114f98042129fdbdad71df762c71a1b0d42b56c21714283de4451877d242
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://vilenefex.ru/strik?utm_term=www.daypo.com+examen+teorico+colombia PDF link annotation
    • https://xinotojopafexiz.weebly.com/uploads/1/3/4/3/134316842/ludatekekobu.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/rilenosufadebo_gasumelu_legibejavida.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/Wichhgj/mosogu.pdfIn PDF document text
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/telem_kubijaxidujukul.pdfIn PDF document text
    • https://kekufekogaj.weebly.com/uploads/1/3/4/7/134768560/04d77e91c.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/jatewej.pdfIn PDF document text
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/magovujovebo_ripaxo_sanadopagafaji.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/dghiiXj/pixajokize.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/GVjeSib/pixel_worlds_mod_apk_1._5._10.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://s3.amazonaws.com/vavabi/takeuchi_tb016_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/2019_ap_english_language_and_composition_free_response_question_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab40e45-8ead-4428-9325-8e534b1b776e/96161462658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df01946f-c3ef-4ee2-b8b0-7d5d2334c8fd/what_are_the_major_components_of_marketing_information_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ac4717-f9d3-4be2-8a6f-11c2e133b4be/68000630460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f7fb68-4788-4b9e-ac95-25f6086ed7ca/wafazapepuxojodejilujanuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb8753f-1082-4994-9925-b591bd6d5be4/what_is_the_average_salary_for_software_tester.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/51927715424.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/mit_architecture_portfolio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dfdddb-6235-4988-b707-58ab5ba77612/how_to_write_a_letter_of_intent_for_a_job_position.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ab632b-2885-4416-844d-aa7de62c897c/11791017720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65e804de-e664-4e04-b967-102f868de92d/vonuvo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 5276 bytes
SHA-256: 0151be2c4da97abedb7622768ce65e6a450d687e0de7b10f8b3ed444e490b32a
font_01_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 11444 bytes
SHA-256: 512f9756362f575258419d659e33e5de393d64dbc44afd1e7e5db89b0fb89712
font_02_sfnt_off00013df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3