Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68424c2a731fbb7…

MALICIOUS

PDF

76.9 KB Created: 2021-03-13 21:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b4e67337517b431918a21ec4e6af32f9 SHA-1: 22026ae5da241cdadd4081ffccb0be750f9484c3 SHA-256: a68424c2a731fbb751f4c04cb0b1a022e029165d3537467719dc76fa5f6cb6f9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. One of the primary external links is to zajinet.ru, which is likely a redirection or phishing site.

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://zajinet.ru/strik?utm_term=how+to+charge+gopro+8+black PDF link annotation
    • https://nugakowizadofo.weebly.com/uploads/1/3/0/7/130738823/9ff2c8.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/jjjemia/sudoku_very_hard.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/tegokezogopevot.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/9325812.pdfIn PDF document text
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/3576404.pdfIn PDF document text
    • http://kenufapozij.22web.org/dapple_grey_horse_for_sale_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/rfqXhiz/old_classic_board_games_list.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/o_neoliberalismo_david_harvey.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/f8d23e69-1b20-41bd-ba5b-2d6a3470c204/oreilly_learning_spark_2nd_edition.pdfIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_b2368c8f9ed64b04a339b1b85c61c12e.pdf?index=trueIn PDF document text
    • http://tinasixubu.epizy.com/vidmate_apk_latest_version_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a9cc96a-2d4a-44c3-abcb-e9ad4a8b4f41/how_do_i_adjust_the_belt_on_my_proform_treadmill.pdfIn PDF document text
    • http://xamudakosenezi.rf.gd/58916461862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb60199-f643-42c1-aafa-224399f04554/40889929129.pdfIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_45746ea449c446e09da0904140189324.pdf?index=trueIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_91a21f814d3b4961a6836ebf499bfbb4.pdf?index=trueIn PDF document text
    • http://weparaxopulo.atwebpages.com/7064550489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd395680-930a-448a-a8f1-2ffdf10d4e57/karcher_pressure_washer_problems_electric.pdfIn PDF document text
    • http://baxewape.myartsonline.com/calculus_1_book.pdfIn PDF document text
    • http://dudulumunir.epizy.com/real_book_jazz_standards.pdfIn PDF document text
    • http://zajegugolex.epizy.com/azure_information_protection_scanner_high_availability.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc11090e-eec3-49b4-8db4-f3b7bc12abc6/elite_platinum_6_quart_pressure_cooker_manual.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_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 5468 bytes
SHA-256: 04c8d79e3a7be5ae1affc1385f49af8c467bae7af5a4a9e65807c96198b41cc7
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 10484 bytes
SHA-256: ee47fccca70c9a731f67423b21e88ffd1a41f85a77d6f8d4d13008b682eec3ac