Malicious PDF — malware analysis report

Static analysis result for SHA-256 78de4df789919593…

MALICIOUS

PDF

77.9 KB Created: 2021-04-28 21:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 76b8be2349d9252732eb2995281a9472 SHA-1: a853c8f695a2332be76e57d3c4a547120c8dd268 SHA-256: 78de4df789919593a6535cd72135d272969527a064ff25cab9a6c7b9a8e1377b
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The embedded URLs, such as https://dugedepap.ru/strik?utm_term=how+to+reset+heil+furnace, likely lead to malicious content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=how+to+reset+heil+furnace PDF link annotation
    • https://cdn.sqhk.co/moromasi/ueqUjgl/mupikupodoviritiregebu.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/h2zdgha/npo_guidelines_asa.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/ihUyt7k/lujurirujigijewup.pdfIn PDF document text
    • http://lazuvozesodot.iblogger.org/63727143716.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/hegemonya_nedir.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/rawesopojifozikitisegit.pdfIn PDF document text
    • http://fopijuzege.22web.org/vehicle_insurance_certificate.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/dgcWn2V/basket_wall_decor_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/e7Shezn/12948741734.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/04a4efbe-4da5-4fc7-96fc-22ed87b6c58a/15841491726.pdfIn PDF document text
    • http://nebokidib.epizy.com/18018975869.pdfIn PDF document text
    • http://webidiwotew.epizy.com/accounting_journal_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303f5c40-3ad1-4a59-980a-eb8283ef3b23/lokeludadeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4400583f-d710-4418-aefe-5f209a355721/2019_ashrae_handbook_hvac_applications_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7c2e26-5929-4fb5-b962-e301bfae58ec/99863330538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55aba02-d9c2-4484-90cd-b1b831f05f3e/35046870648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fdf6a67-20b9-487d-8bf3-80853bfcb8f5/14702000655.pdfIn PDF document text
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_bd59fdcac06e4113a266ec991c89c8b6.pdf?index=trueIn PDF document text
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_70b7d484d7584b00a0d1c966194d010a.pdf?index=trueIn PDF document text
    • http://biparux.epizy.com/alphabet_board_games.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_50c05eaba9ea44678e11dceae4c8ca03.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_2246d0024d3940479e739600406757a0.pdf?index=trueIn 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_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 5024 bytes
SHA-256: 058a1f89b91b550192cefe6751bcbbbe9836709c401b6320a21f1b5a3f88c49b
font_01_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 10548 bytes
SHA-256: a74c8e3fee19da14bae322fbde272d669ae055830e073d27d0aed54bbc01af90