Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23b29e2198af0f3…

MALICIOUS

PDF

85.9 KB Created: 2021-03-25 10:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c4607eba8c151e50d7428518e39749d6 SHA-1: 24fb5b38fa92daf413d9b99eb3c64c0b00ac41e4 SHA-256: b23b29e2198af0f356d594a4a55ef66a086bf32d1378b434bf2667db02211a77
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML heuristics identify this as a malicious phishing PDF. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=best+quotes+game+of+thrones+books PDF link annotation
    • https://pevigegokepos.weebly.com/uploads/1/3/4/3/134366184/vokofad.pdfIn PDF document text
    • https://jutulomivepira.weebly.com/uploads/1/3/4/7/134775876/pibat.pdfIn PDF document text
    • http://mebutef.22web.org/somaradoj.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/8855641.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/c8igL0D/70726922614.pdfIn PDF document text
    • https://bejelasinodajib.weebly.com/uploads/1/3/4/7/134764461/d16428f8c.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/gimibobemabalefikov.pdfIn PDF document text
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/gefabulufa.pdfIn PDF document text
    • http://gakesatigefa.22web.org/saxon_math_book_answers_algebra_1.pdfIn PDF document text
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/wegolonenipeje.pdfIn PDF document text
    • http://rugenaxuw.iblogger.org/90401287095.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/Acj7iit/16982414316.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
    • http://nuwenukaxoxigam.rf.gd/mdu_b._ed_syllabus_2020.pdfIn PDF document text
    • http://zoridod.epizy.com/administracion_de_recursos_humanos_idalberto_chiavenato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/043a1dfc-f492-48e0-bf22-e918b0bcd450/namaredaxoxogimimarupeta.pdfIn PDF document text
    • http://juzatapanosuwi.rf.gd/81429850730.pdfIn PDF document text
    • http://dekutob.epizy.com/android_9_root_access.pdfIn PDF document text
    • http://zabuzuko.epizy.com/31524610816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7aeb62-57f8-4f6e-ba65-1857805201d0/67727324241.pdfIn PDF document text
    • http://widafasamuj.epizy.com/call_of_duty_ghosts_xbox_one.pdfIn PDF document text
    • http://mowiredeponup.rf.gd/tigexovidekovader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018a6491-c261-4432-bc84-0842d4e1ec91/10144504672.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_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 5364 bytes
SHA-256: 13fb607f7a0f51bef67e908c8e45e09a6216854584bbaaede44629eecbc134ef
font_01_sfnt_off0001165c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165C 10928 bytes
SHA-256: f38530d070a079e70767250b263ae0bb1f8db332d5bbc4c30d773a792f790f77
font_02_sfnt_off00013b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B88 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e