Malicious PDF — malware analysis report

Static analysis result for SHA-256 6851e8d0cb90adbc…

MALICIOUS

PDF

85.6 KB Created: 2021-03-21 11:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e34f4fb8c194ee907211e17bfefc6dcd SHA-1: 25a7c51dfa62b1f62e6d931bb4dcd1b3bac1e0e1 SHA-256: 6851e8d0cb90adbc05dec868a40ec98de6e58aa5dc09314363fc709657964445
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=bodyweight+workout+app+iphone PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393483/normal_5fc905f07a115.pdfIn PDF document text
    • http://luminar4-download.xyz/23539208551zbuih.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_60567104247cb.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/kuluxikinovo_pijome_bisaxujezemuluv_nufuru.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/aicEFhd/12887935314.pdfIn PDF document text
    • https://rezilatepupegox.weebly.com/uploads/1/3/5/3/135318796/6905205.pdfIn PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/99f1a18020850.pdfIn PDF document text
    • http://heliusdesign.ru/houghton_lake_mi_snowmobile_trail_reportmyq6r.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/gizjbib/25181645161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_5fd8e9d35ec1e.pdfIn PDF document text
    • http://bidimiw.sportsontheweb.net/33875770156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480745/normal_603bdfbdee19c.pdfIn PDF document text
    • http://helpcenter.business/ladagarubepezoww4uly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fcedc8dad2c9.pdfIn PDF document text
    • http://getyourscore.info/what_is_the_etymology_origin_of_the_word_dragonty63q.pdfIn PDF document text
    • https://cdn.sqhk.co/tozijizubu/jLuUJhy/top_100_golf_courses_in_the_us_map.pdfIn PDF document text
    • https://filewefoxu.weebly.com/uploads/1/3/4/7/134750201/2186777.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/the_daily_stoic_journal_amazon.pdfIn PDF document text
    • http://trysalon.xyz/bhojpuri_video_dj_waladtvg7.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/jakedofi.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/Hrghbji/need_for_speed_most_wanted_remastered_mod.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/3ff3fa59-431c-4007-8958-1df92d3aa935/what_is_coh2o6_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247f0b21-3c5a-4385-a1aa-8fe387319358/how_bp_apparatus_works.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064009a6-5de1-476c-936f-0d6f41b4234b/la_biblia_latinoamericana_espaol__english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fdd04c-5484-4e10-b7bf-35e88d9926b4/frases_amor_en_tiempos_de_colera_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7385d03-479c-4f48-a014-9338fe24dd49/how_do_i_open_a_garageband_project_in_logic.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_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 5316 bytes
SHA-256: cbd27abf67ce1304c05fd3ab2c40b3a75edaab9857aee059f1cc729a020d982f
font_01_sfnt_off00012063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12063 11688 bytes
SHA-256: 821b670a4438579e6806352b92e33a3c21e4fc0a1d224fc8ae4961a391b9a3ed