Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c455326bfaee43…

MALICIOUS

PDF

94.0 KB Created: 2021-06-01 03:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a408458e8f3bccfd3a34c79f3224cd83 SHA-1: a93228210c0e15d78f1feb8d5ee9ac09d6a486d4 SHA-256: f3c455326bfaee43c21e83e1d4ac34422dae812a7d761236ece7be10392e2f9d
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, with one prominent URL pointing to 'medvor.ru' and seemingly related to a weight-loss scam. The document body, though heavily obfuscated, suggests a lure related to 'reducing belly fat'. The presence of embedded JavaScript, though not directly analyzed for specific actions, is a common vector for malicious PDF exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://medvor.ru/pbw?utm_term=which+cream+is+best+for+reducing+belly+fat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453337/normal_5ff4b107beaac.pdfIn PDF document text
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/3568167.pdfIn PDF document text
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/sodawudifed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417813/normal_5fc915122e36d.pdfIn PDF document text
    • https://vubedokixe.weebly.com/uploads/1/3/4/7/134716192/litisizalemev.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/f5231635b05a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477409/normal_603e0cd14bfdb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478402/normal_5ff7ed7e3910c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480905/normal_600d16523159e.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/ac3aa8e9-c94c-40fd-850e-cd3414c7496c/87850443519.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/w/file/fetch/144425988/la_era_de_hielo_3_pelicula_completa_en_espaol_hd.pdfIn PDF document text
    • http://xovelezid.pbworks.com/w/file/fetch/144416028/krunker_io_aimbot_free_no_download.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/pattern_worksheet_6th_grade.pdfIn PDF document text
    • http://xorunezagu.pbworks.com/w/file/fetch/144435813/top_5_best_live_wallpapers_for_android.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/31063552953.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/w/file/fetch/144427092/iobit_driver_booster_6.5_key.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/w/file/fetch/144434799/istanbul_tatili_filmi_full_izle.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/35446960709.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/kuboom_3d_fps_shooter_apk.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144411678/survivor_39_episode_1_watch_online.pdfIn PDF document text
    • http://bofamawetodo.pbworks.com/w/file/fetch/144432582/how_does_a_fire_tv_stick_work.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144427872/53580350425.pdfIn PDF document text
    • http://degenazi.pbworks.com/f/dujemodoranebotowajet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90283004-e07c-4b91-b4ce-64e2412b4e1b/graphic_design_salary_in_mumbai.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/f/85870395769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6664caed-fd64-4962-b551-eeccd44026c0/how_to_repair_hp_laptop_battery_at_home.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_off00013170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13170 5692 bytes
SHA-256: e4a4206150edcc3619da436cf60f61876d75ce185b55123695e06fbc77ab2380
font_01_sfnt_off000144b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B4 11048 bytes
SHA-256: 0f02f0a62c8a4d04412fef23a1a0dee517692e5b11807aed2e6a9c62d4bfa9e6