Malicious PDF — malware analysis report

Static analysis result for SHA-256 d281c8a6fa236dcd…

MALICIOUS

PDF

84.6 KB Created: 2021-02-25 18:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 30b97e112254a9907e8449e563cc5d0e SHA-1: d219503e91132d723fc693a13d8d85aa64a483a7 SHA-256: d281c8a6fa236dcd16be7b57d7c1073c7138667ec5edccf175fec5e06fa11cda
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=sex+and+the+city+movie+2+where+to+watch PDF link annotation
    • https://cdn.sqhk.co/diwamukef/cLq9ig3/47930902332.pdfIn PDF document text
    • http://lamovingcompany.com/night_shift_jobs_in_mumbai_work_from_homeu7ift.pdfIn PDF document text
    • http://orbitan.fun/91301788455y359w.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/djfgeih/road_crash_bandicoot_tips.pdfIn PDF document text
    • http://carins.info/buvawufobepedasnfq44.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/bij7Nif/zombie_apocalypse_map_minecraft_1._12._2.pdfIn PDF document text
    • http://thedefenseforge.com/ducktales_theme_song_piano_sheet_musicajtpt.pdfIn PDF document text
    • http://loxebosobudi.66ghz.com/35113323605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485930/normal_6011b67e5c032.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/Eu22Kii/theme_park_simulator_rollercoaster_paradise_ps4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490920/normal_6036f4fe85273.pdfIn PDF document text
    • http://creamwalls.space/arupu_lyrical_video_song1tud4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rujidafedisezu.atwebpages.com/solucionario_algebra_lineal_grossman_5_edicion_espaol_gratis.pdfIn PDF document text
    • http://povinadoli.epizy.com/duraflame_infrared_heater_parts.pdfIn PDF document text
    • http://baxodivol.rf.gd/l_movie_video_song.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_off00010c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 5524 bytes
SHA-256: eb8e6c305b9b636e732fd15825dc17d2d9fab7a06f0ced0f315e135a1c874017
font_01_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 11376 bytes
SHA-256: d5906cb03d2573f03d423c112e576c1c750a87e06919b6a28b0439cb619d88d5

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