Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b2cc21c5dc54fc…

MALICIOUS

PDF

75.8 KB Created: 2021-05-08 12:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d0dc4fdc01a9fb926d2866d7122f5b44 SHA-1: 268b4811a28d92010ccaa5ae5ceec46b86fc92e2 SHA-256: f0b2cc21c5dc54fc817be073f19d68792846ba545bad851c42e20799d141660b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://jacksth.ru/strik?utm_term=define+derivational+affix, is likely part of this scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/strik?utm_term=define+derivational+affix PDF link annotation
    • http://salebox.shop/wheel_of_time_book_14_paperbackxwicd.pdfIn PDF document text
    • http://sozaxesugoj.mywebcommunity.org/aristoteles_gran_etica.pdfIn PDF document text
    • http://ontrade.top/nidopivonapejak10ptr.pdfIn PDF document text
    • https://dafizigupiteg.weebly.com/uploads/1/3/4/4/134492389/1709245.pdfIn PDF document text
    • https://xadokefaxigewaj.weebly.com/uploads/1/3/4/3/134314424/relusilujeb_gepiluxopi.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/sawamakimevolulogo.pdfIn PDF document text
    • https://xijiweba.weebly.com/uploads/1/3/5/3/135387982/mebupurige.pdfIn PDF document text
    • http://christinaanddavid2019.com/teroxipuraxizowisovouuvyo.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/andhra_bank_internet_banking_application_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_6047d35eafb43.pdfIn PDF document text
    • http://madamzero.com/over_the_rainbow_cello_sheet_music_freem2vzm.pdfIn PDF document text
    • http://vizilirudigub.getenjoyment.net/ripupugawo.pdfIn PDF document text
    • http://vumegebopim.iblogger.org/47974974879.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/8808074.pdfIn PDF document text
    • http://fkpravo.ru/44934492361uyxg0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_602d649bbcc72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kufosejuwures.rf.gd/57702924787.pdfIn PDF document text
    • http://rowezezivifa.epizy.com/interior_angles_worksheet.pdfIn PDF document text
    • http://niselekotoz.myartsonline.com/54133531793.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_f9fee166e4ab4e3395f4785b7d1f4979.pdf?index=trueIn PDF document text
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_8ead92727dbf4b2f8855b3f5bfe6ae9f.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_7bf9b023880d45b9a20a9d928dfdda68.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_984655e7a8dc4bc180ed632e00ef1e31.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_89251d41031248a5a61b3ba054b84d97.pdf?index=trueIn PDF document text
    • http://gotozowixefe.epizy.com/trigonometria_1_bachiller_ejercicios_resueltos.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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 4848 bytes
SHA-256: a3f7f9c574726ed957aa51f72331f882cae20cdda388fa2ea0bd8a15a9e8057e
font_01_sfnt_off0000fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 12152 bytes
SHA-256: 333c4129b3b9a89af42e354dd767b4c8069588fc27b3865c8ce74f1f83ff44ce