Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b9347bf071dd31…

MALICIOUS

PDF

75.4 KB Created: 2021-06-01 10:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ac5183deb669f9cf6f018602ed86a4e1 SHA-1: 35e7aa415bd471e0cd154ee9dbdf951bc352f424 SHA-256: 30b9347bf071dd31e44e5235b9dcad13b80f73bde84f4950c59fe10439b62f80
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to link farms on services like pbworks.com and weebly.com, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://nomylo.ru/pbw?utm_term=exam+fm+study+guide+actex, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/pbw?utm_term=exam+fm+study+guide+actex PDF link annotation
    • https://vobudogekatobef.weebly.com/uploads/1/3/0/8/130874620/kapisu-nefabinozuxedoz-pudopitukem.pdfIn PDF document text
    • https://fuxekuliwomu.weebly.com/uploads/1/3/4/8/134864819/9086654.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusagem.pbworks.com/f/apocalypse_of_zephaniah_text.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/descargar_pokemon_mundo_misterioso_exploradores_del_cielo_espaol_mega.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/76961571907.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144426870/79816565161.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144415191/fuxabekosoli.pdfIn PDF document text
    • http://garigor.pbworks.com/f/37896992815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44816bbc-9953-4c42-94d2-ac18f82d1271/gagabatatok.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/euonymus_alatus_growth_rate.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/geometria_y_trigonometria_baldor_descargar.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144449994/can_you_install_google_play_games_on_iphone.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/gelawuzudof.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/f/67040847166.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/ludusir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/700f2e00-349b-4503-b956-3968f34165dd/duxosomizifijilitowivobif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c63133c-40a1-4ce1-bb6b-eb89368cd99d/66722968558.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/un_decametro_cuadrado_cuantos_milimetros_cuadrados_tiene.pdfIn PDF document text
    • http://masawumel.pbworks.com/f/how_to_pass_the_mblex_exam.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/f/butterfly_line_drawing_images.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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 5340 bytes
SHA-256: 237efccf5c1448cf9e286661ea0473eb9892794d279e4441a1209b6631af6dd4
font_01_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 10604 bytes
SHA-256: ae07718df5090b41c0ae0cf4d5c808ff592d8a4746964ce9840eae05f4674bbb

Open this report in the interactive analyzer, or submit your own file for analysis.