Malicious PDF — malware analysis report

Static analysis result for SHA-256 4deaed2e3c67067e…

MALICIOUS

PDF

77.5 KB Created: 2021-03-08 09:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f6b342a49d8d53fad7f47f80ba8c4e94 SHA-1: 221fc1d2c9c7fdcdb02c9598f3d11537a1b80ff0 SHA-256: 4deaed2e3c67067e6b3f6758701dbeab4e3f3fa47b962db33137eb5c882d241f
126 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains an embedded URI pointing to a suspicious domain, 'midufefew.ru', which is likely used to host malicious content or phishing pages. The PDF's structure and the presence of external URIs suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=parental+stress+index+scoring PDF link annotation
    • http://gidilixad.66ghz.com/31762436654.pdfIn PDF document text
    • https://cdn.sqhk.co/lixijadimit/jfiiGjg/best_las_vegas_bus_tour_to_grand_canyon.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/TBifTji/wepizukafeg.pdfIn PDF document text
    • http://potobol.22web.org/72942900243.pdfIn PDF document text
    • https://cdn.sqhk.co/jifigetuxu/0ihYVMA/play_free_online_horror_room_escape_games.pdfIn PDF document text
    • http://fuckfrsky.com/uses_of_mean_median_mode_and_standard_deviationlalsi.pdfIn PDF document text
    • http://natiral.space/kamen_rider_city_wars_english_patchrfd9z.pdfIn PDF document text
    • http://wusujobarowi.22web.org/alvin_kamara_injury_report_week_10.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/Ussgiic/roblox_promo_codes_list_for_robux.pdfIn PDF document text
    • http://dhl-order.info/66688243376bd5w5.pdfIn PDF document text
    • http://luminar3-download.xyz/generate_battery_report_windows_8etih0.pdfIn PDF document text
    • http://gezinuloxi.22web.org/pifamotozelisaxawatifowak.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/3ade74e2-4410-4319-b427-56b3d520c3aa/niwafugevekafaguwoler.pdfIn PDF document text
    • http://zijijexumejege.rf.gd/the_bfg_1989_giants_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54de14ed-9864-4007-af33-0577282641f7/goleru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a690296-b3eb-49a1-b1cb-2db43d5e07cb/linux_basic_cheat_sheet.pdfIn PDF document text
    • http://jasudewibolix.rf.gd/jee_main_2016_question_paper_download.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_6e0f8ff5c0e945f8ac2410bd1307b154.pdf?index=trueIn PDF document text
    • http://lopumupukerodu.epizy.com/yahari_ore_no_seishun_season_2_episode_13_explained.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_29b16e9f59b64c32a9eb544b8b9ab62a.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_05faf4767e9c436ba8c4e84d1c506a0e.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_13482ab01066477cae02b5d81f008656.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/307f8eca-2374-4abe-b406-9d77d08f300c/meyer_e47_rebuild_kit.pdfIn PDF document text
    • http://zegokufa.epizy.com/zepoxesuk.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_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 5176 bytes
SHA-256: 36e45fb02835d92bf9228cf6d26d20a05a45304ee6dc35b6cfd17688d577e0bf
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 10172 bytes
SHA-256: 3981ed666ef5d2396c68908717ba96a8b2abda939d8deb550bada2539440cbf5