Malicious PDF — malware analysis report

Static analysis result for SHA-256 767ac0b16d1c9086…

MALICIOUS

PDF

129.7 KB Created: 2021-06-14 09:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 582ffca654841112104c2ad5d28fa329 SHA-1: c6a73e228621cfb003aee793e5fba38722f0bdc5 SHA-256: 767ac0b16d1c90867bf99c63901e68202309ad96274f0599b58f6dc66d7f798d
146 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, impersonating cloud services to trick users into clicking embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary IOC is a suspicious URL that appears to be part of the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://crophysi.ru/123?utm_term=libreoffice+spreadsheet+vlookup PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452862/normal_6059e640e998e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417129/normal_6002c5da13b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_60b8e0f1be759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490370/normal_6001e5bf7cd60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405190/normal_6006d43c2584f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_6022c9abb0a2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410191/normal_60c6797d3d387.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421641/normal_5ff5f8923aa68.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://lakebimutep.pbworks.com/f/pigebe.pdfIn PDF document text
    • http://tinigogazos.pbworks.com/w/file/fetch/145172283/mx_player_mod_apk_no_ads.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/the_tragedy_of_romeo_and_juliet_act_v_cloze_activity_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b55ba3a5-1a83-4979-a776-5bec14e963c9/padiwaxunavifasivivox.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144437379/spectrum_rc122_remote_codes.pdfIn PDF document text
    • http://duvetemeb.pbworks.com/f/easy_songs_to_play_on_piano_notes.pdfIn PDF document text
    • http://pizuwamamevu.pbworks.com/w/file/fetch/144737829/dumokinafujuxuwuwipake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6954fa0e-0954-4fc9-9091-5a83471bf651/wilderness_first_aid_course_new_hampshire.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144420216/cuentos_cortos_de_aventuras_para_nios_de_secundaria.pdfIn PDF document text
    • http://sakulibur.pbworks.com/w/file/fetch/144629304/xoxajubixerazupoweze.pdfIn PDF document text
    • http://mamejoniza.pbworks.com/f/how_to_turn_a_webpage_into_a_mac.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/uc_browser_for_java_mobile_free_download_version_9.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/w/file/fetch/144503079/wojefe.pdfIn PDF document text
    • http://gurilotav.pbworks.com/f/8093859554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b990f02-afa1-4ecd-911b-551a73b3f63c/how_to_report_ei_hours.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001992a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1992A 5224 bytes
SHA-256: 6d6593cd1037196532a341784cec98256278597f69d0e0ce35a25747c456d781
font_01_sfnt_off0001ab04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB04 12596 bytes
SHA-256: 99788d3746149f2768a9e7e5015dc20846f53b1f58eb63624098bbeecf4e6965
font_02_sfnt_off0001d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D532 16064 bytes
SHA-256: 8c4fa6f7f40dddb459409f1ad5ce35e05a60a330ee998b25fa89a66cf5d19628
font_03_sfnt_off0001e9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9D0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c