Malicious PDF — malware analysis report

Static analysis result for SHA-256 4762ad72462b81f9…

MALICIOUS

PDF

115.5 KB Created: 2021-04-25 17:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6f96236ac1d6e9c9e8cc8d61a2f21735 SHA-1: 1e8fe4b65817ec7b66acab7816bd11a993625bc9 SHA-256: 4762ad72462b81f97f428c835acb07995b351e0dda24b228d831abbfe5541a97
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of SEO spam or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=what+does+under+the+eye+mean+in+the+handmaid%2527s+tale PDF link annotation
    • http://taforojujutusig.mygamesonline.org/troy_bilt_lawn_mower_belt_replacement.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/20780931088.pdfIn PDF document text
    • http://lawexape.mygamesonline.org/fekurekexijobivavivokode.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/3f821429947cd.pdfIn PDF document text
    • https://kevapesezivobi.weebly.com/uploads/1/3/4/8/134893959/8199294.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/843654.pdfIn PDF document text
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/niloxafada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://34ec465e-51aa-4dba-9a8c-c05fcfb5ae84.filesusr.com/ugd/df15ee_7ffa879dfb974bb0809bbdd2c0ab7295.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d4aa81-6e60-4c26-9092-08853be29c49/foxibidesozigujo.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/83440359821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6334a45-703f-474f-9e32-19edae8213d7/how_do_i_update_realtek_audio_drivers.pdfIn PDF document text
    • https://ae9cd3fc-a2ed-4114-aa96-dd53a7e96ab4.filesusr.com/ugd/22cbe6_2bc753b75f5343709cb18be3a533164a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6378558d-78d9-49b9-826f-f76b308a16a7/80895641801.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555980f0-4875-404e-b169-0b10e7abf9ff/37634895981.pdfIn PDF document text
    • http://korofituzuxigu.onlinewebshop.net/48551474706.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/bisiditemukewewekip.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/clarinet_sheet_music_popular_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/how_to_win_the_4_digit_lottery.pdfIn PDF document text
    • http://fetekovabu.onlinewebshop.net/podoxizowanazunilemur.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_866bcb25230d4adaabe4718f25a52f10.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b118e83-703f-46e6-8cd9-ccd6a23ce71a/lobovibonobaxotisurur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c381091-aa40-41aa-b171-f43f828a1d0a/56759815457.pdfIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_783c0968871b4fceb3b275557b5794dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/bhojpuri_bhakti_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed883bc1-9f2b-466a-bef9-f3f5429431b8/2016_dodge_ram_2500_6.7_diesel_owners_manual.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_off0001825c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1825C 5212 bytes
SHA-256: e9a96d3be0052fd0a883e8c8b7d039296dcf15a847819b0256120d79b3bc2ba0
font_01_sfnt_off00019401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19401 13644 bytes
SHA-256: dee2e9eccfd5b32844b3831f3c144b78f5b7cd4717da00d9e2ceb890818fc1f6