Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c606156115df02…

MALICIOUS

PDF

70.3 KB Created: 2021-03-15 05:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9657ba57261a181630add0d90ba1ce0b SHA-1: dcbc65081d359c492e1ee94e3f68126dd92c9b3f SHA-256: 41c606156115df02c857f9cccf1b0d0664317cea2275ccf9afbb3d3d888ab03c
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://dafemum.ru/wix?keyword=planet+minecraft+medieval+mansion PDF link annotation
    • http://liolika-rsya.ru/liftmaster_error_codes_10_flashes3o562.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/lidipilole.pdfIn PDF document text
    • https://rinapaluvubozi.weebly.com/uploads/1/3/4/6/134669605/pogipunixag.pdfIn PDF document text
    • https://solakozejifu.weebly.com/uploads/1/3/5/3/135347449/e0abc.pdfIn PDF document text
    • http://souve.me/pete_the_cat_and_his_four_groovy_buttons_worksheetsec6p6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_5fcb690280bdb.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/1242544.pdfIn PDF document text
    • https://tixuguzuw.weebly.com/uploads/1/3/4/0/134096155/3c9f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417536/normal_5fcc19362905c.pdfIn PDF document text
    • http://good-production9.site/ccna_icnd2_study_guide_3rd_editionr8zco.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_6010c45c11225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_600913f0a78aa.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://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_92ec9fbd12a24e2e9063e383dfee5713.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72674064-a137-4759-a09e-1373ddbff076/12791747861.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73cb0aa2-6df1-44b6-83df-c60f87316fdd/dd_dungeon_tiles_reincarnated_city_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b540d952-f50f-4de8-891d-fbd532c8b17b/rometewowibiz.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_071d3e7ec74840f88d2df915479fe3d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/facadc40-9fbb-48fc-8f94-630545129996/15140216688.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_665b82bc235f4e7bad73d848e1390b5e.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_8099031b631a4722add4950e76e40468.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85bdfcd1-6f9f-438b-9c77-0d5482e554dc/sat_reading_passages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f76167c4-50f2-45ba-a937-e1eaa3d55d79/farming_simulator_15_ps3_codes.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_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 5016 bytes
SHA-256: c32ea62aad12811a97cc1152e1adee2b56202f9115be7116b649f70cd2091416
font_01_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 10176 bytes
SHA-256: 0b6f1c231a09a65ec6b513618dd99e67ca40d0f2590954822d0514df45338a19
font_02_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f