Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c9676bbda2235c…

MALICIOUS

PDF

92.4 KB Created: 2021-06-11 03:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d78dd85a821ab358c35afd1e771e2f2a SHA-1: 4e2c4b1523eb56cbdb09f6f649b0f017c1ae1950 SHA-256: 78c9676bbda2235cbdfe103cd509a3350b2abb65a0466521922b6d429de922b9
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 pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ponafet.ru/123?utm_term=information+american+airlines+flights PDF link annotation
    • https://daxakowov.weebly.com/uploads/1/3/4/7/134704390/00ddbf.pdfIn PDF document text
    • https://kolabobinojojiv.weebly.com/uploads/1/3/4/8/134880551/sunetivimikoka.pdfIn PDF document text
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/1406012.pdfIn PDF document text
    • https://monotuwisax.weebly.com/uploads/1/3/4/5/134589760/175e1e99d62.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/905cbe18-915c-496d-b61d-60e80c11087a/madden_08_download_mac.pdfIn PDF document text
    • http://daladefadus.pbworks.com/w/file/fetch/144869643/love_ringtone_mp3_download_pagalworld.io.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1ac1f7-1bc7-4917-8e06-67b35b8edd49/what_are_the_5_leadership_styles_in_nursing.pdfIn PDF document text
    • http://jumogitakos.pbworks.com/f/skywars_maps_hypixel_download.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/f/perfumes_the_a-z_guide_2018.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/f/79934979978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da59f9b7-4811-4783-8342-f6f75d07b994/lola_lago_detective_vacaciones_al_sol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4322f66-0208-4016-a8ff-06a7bfde824c/rujibumebef.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/w/file/fetch/144911994/town_hall_11_best_defence_base_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139bc5aa-8f5a-487b-af39-b066eb47b8b9/sap_front-end_server_in_a_productive_system_landscape.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144634995/vudetovo.pdfIn PDF document text
    • http://vutajake.pbworks.com/f/devagufeja.pdfIn PDF document text
    • http://jananevava.pbworks.com/f/premam_malayalam_movie_download_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536a7ce9-7d7b-4cab-8a0c-4ad42f335150/nijomik.pdfIn PDF document text
    • http://rajejor.pbworks.com/f/romanian_grammar_exercises.pdfIn PDF document text
    • http://wuwolufit.pbworks.com/f/tom_and_jerry_movie_2021_ozuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b08a53a-7986-4e9c-a1e5-2468c95942a1/ejercicios_verbos_regulares_e_irregulares_en_ingles.pdfIn PDF document text
    • http://fabopebakib.pbworks.com/f/at_home_workouts_for_ectomorphs.pdfIn PDF document text
    • http://fuxijovipa.pbworks.com/w/file/fetch/144721317/595256138.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144580560/sony_xplod_price_list.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_off00012c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C46 5232 bytes
SHA-256: 351617e97fbbd97e92eb0ce54621200e7ce102751b868f4e963899d1112a55ed
font_01_sfnt_off00013de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE3 11264 bytes
SHA-256: 89429d42fef60de8dcda16081a709038304e31e9ee49e73dea7e0cdcdbce1e1a