Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8e0331beff85db…

MALICIOUS

PDF

76.1 KB Created: 2021-05-06 23:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1a55dddf7df8b412dd787fcecfca4f32 SHA-1: 04a8d985804099fc4f42f3ef3f5efb9fc792eaa6 SHA-256: 6e8e0331beff85dbbf613b26dc690f9c963905a2f79fd502bc56d7e617adc3f8
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 intended to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

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://xezojetit.ru/strik?utm_term=how+do+you+write+a+movie+title+in+apa PDF link annotation
    • https://cdn.sqhk.co/kujufemom/aheVehf/zegufosalupu.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/vebewevotujopupi.pdfIn PDF document text
    • http://zufonirawanowo.iblogger.org/pekagalufav.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/xugulevafelake_ribasatiwada_wabanake.pdfIn PDF document text
    • http://votinegabes.iblogger.org/wakevukaluwibup.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/gK1cqcK/is_the_cruise_ship_industry_done.pdfIn PDF document text
    • http://jitudowifite.iblogger.org/kapazonowuvuxidexanowoj.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/hLjjBjd/brave_fighter_demon_revenge_unlimited_mod_apk.pdfIn PDF document text
    • http://zoferili.22web.org/fotikegek.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/yibgehi/38072526517.pdfIn PDF document text
    • https://wixivowid.weebly.com/uploads/1/3/4/6/134689466/tipoludanijob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://womefobusefox.rf.gd/stokes_theorem_examples_and_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32982a20-45c0-4aa1-94cd-4679b6e0bd15/college_algebra_test_questions_and_answers.pdfIn PDF document text
    • http://morinebasipu.rf.gd/antiarritmicos_medigraphic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd403a85-dd36-4c4d-95cd-1b5ddbe203d1/a_first_course_in_the_finite_element_method_logan_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1d242b-bf8d-49e1-9fee-a2cdc8a02afe/freshwater_fishing_lures_types.pdfIn PDF document text
    • http://gumofiwulova.epizy.com/18896719277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f73815-7b0d-413a-8664-f70b631533ed/they_say_i_say_4th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/106e7aeb-43f0-40f3-b21e-9ecea8a0ea74/vikexekedidosivavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62dfe3a9-0d95-448e-bd65-0669b9e10055/windows_command_prompt_commands_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b74474d1-a357-4040-a381-c99fa75d56f7/kill_team_40k.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_off0000eaf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF6 5140 bytes
SHA-256: 1a5c6accd765c6b737db16b85f6ca9ccefa6a25a5f22b747aedf54f1750cb202
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 10716 bytes
SHA-256: 49e2e91ce2962a6f78199d23300b68277825ba21216a5f821e0d3f4c229d073a