Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2da6c8d89be4293…

MALICIOUS

PDF

98.1 KB Created: 2021-04-08 05:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3da8e7399135d4f25cb49f00edbd2ee SHA-1: b81683b04c6a0d0562451d02feabb8f12799cd5e SHA-256: a2da6c8d89be4293ceb382dea4ab58fa02a55299e109af88c4bd6a275959d871
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 0.9995

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://druttle.ru/wix?keyword=does+dispel+magic+work+on+planeswalker PDF link annotation
    • https://binenivav.weebly.com/uploads/1/3/4/5/134516867/5136486.pdfIn PDF document text
    • https://cdn.sqhk.co/jadizefon/ohaieij/hair_salons_that_dye_hair_purple_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/hdheoij/space_rpg_3_ships.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/popoxenetoxulerufufabatu.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/jbShgje/drastic_ds_emulator_full_version_free.pdfIn PDF document text
    • http://volulolusawaz.mygamesonline.org/38025981064.pdfIn PDF document text
    • http://nexipufogavajid.getenjoyment.net/gibifidalopulizuk.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/icii4ja/million_tomans_to_usd.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/FFCgf0z/rijidenisi.pdfIn PDF document text
    • https://nigoriwidoke.weebly.com/uploads/1/3/5/2/135296580/samifije.pdfIn PDF document text
    • https://kinifuromokemo.weebly.com/uploads/1/3/5/3/135348191/wujose_xumunumokize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/23868251793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ae2bde-f759-4b18-9966-5e7d50207ecd/what_are_the_four_factors_that_affect_carrying_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed3c9fe-48f8-44bd-b168-f7263a1422ba/grammar_in_use_reference_and_practice_for_intermediate_students_of_english_by_raymond_murphy.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/26715298667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae0859c-4e68-4c5d-8026-d9108243ba1b/jvc_model_number_sx-pro_32.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b36947a-b5e3-4694-8467-2d0432e858b2/vemenur.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/whatsapp_blue_edition_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010f84fe-0204-45b8-b79a-ce17c128a747/what_questions_to_ask_when_buying_a_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/becdd1f1-0784-4c86-ba1c-fdae35725e37/diffusion_of_innovations_everett_m._rogers.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/drama_catch_the_ghost_drakorindo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c38890b-1950-472c-9062-a6d70fbb8860/nukuxatabototirugeb.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_off000142a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A2 5548 bytes
SHA-256: 8927b8dafebaa03769eab78271d18e6e2149fd9c47c1b9721d5a3d0c6bfc8643
font_01_sfnt_off00015583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15583 10868 bytes
SHA-256: c512a3afff53d8c760048b15a9470d61bc9d51053ddba169f19a22e293a41fb1