Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f3dd4e09345bb0…

MALICIOUS

PDF

77.4 KB Created: 2021-03-30 14:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a00801276d4b9e2fe70898e3d6053b01 SHA-1: 231d58cb84be6208a85315b92d780feecd8f8938 SHA-256: f6f3dd4e09345bb0874acf4cccd421d8a65fbca06c4a5597a57cc1a94d37c96c
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://bologen.ru/strik?utm_term=listening+skills+practice+work+exercises PDF link annotation
    • https://cdn.sqhk.co/tejosepu/ggHNgj0/shiftgig_houston_address.pdfIn PDF document text
    • http://dle-tpl.site/morphology_and_taxonomy_of_funginfgiv.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gePJjdD/mystic_aquarium_penguin_run_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/0gcCjbB/7980384997.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/gghaoij/troll_face_quest_internet_memes_walkthrough_level_9.pdfIn PDF document text
    • https://cdn.sqhk.co/jupujezaxa/iha0fia/subterfuge_meaning_in_law.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/higgdhc/love_application_download.pdfIn PDF document text
    • http://lastmarkt.ru/xuvosukuxuxigesokel4h92.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/a50D2hc/wemodifava.pdfIn PDF document text
    • http://lestyprin.online/how_to_write_an_article_critique_paperse5lz.pdfIn PDF document text
    • https://cdn.sqhk.co/sumefixes/jfdCjef/bunanasogoxonejamolejod.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/hbdjigg/project_management_certification_online_harvard.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/f31daa93-a2c2-4fd0-af02-51819540527b/where_to_put_electrodes_for_tens_unit_for_knee_pain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da57eb5d-0ef2-4895-9d13-e0e197e64cd5/what_courses_do_you_need_to_be_a_real_estate_agent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20bb8015-67ff-4dfe-b60c-62c141748d17/92217174164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ed6fea-79cb-4a5b-bfde-7991f872ffd6/lalafaposidudozuzorop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18284861-a4ad-45c8-8cd8-fc9cac7b325a/lost_keys_lyrics_meaning.pdfIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_0732ada6378541a9a4c18da608412d4d.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_05b9b28ae0da4682b157f8ad65ce9006.pdf?index=trueIn PDF document text
    • https://24451074-f53b-4065-993c-779ba3957988.filesusr.com/ugd/0ae25f_1b3c013f9cde43f5b4cc579581fffa29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3098a0-f93b-4dc7-bc23-fd39070f865f/nomenclatura_quimica_organica_e_inorganica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eee5831-49f2-4aec-b567-a3b815a790ba/80144395028.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF117 5268 bytes
SHA-256: 7d2a04aad4961617ab0a1de4376f102886aecb64ac813b5114e694d6222833c7
font_01_sfnt_off0001032d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032D 11180 bytes
SHA-256: 4d2b7b95afb57c3166e78203b35050c83160209ba4adb951627ef7b10e10b521