Malicious PDF — malware analysis report

Static analysis result for SHA-256 4781dd6e44b66da7…

MALICIOUS

PDF

93.4 KB Created: 2021-04-16 08:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 05ab05b301fcabe370b089311a289e83 SHA-1: 28c3bb51e00735a378bac2055a523c5743125e80 SHA-256: 4781dd6e44b66da746a4849067c9a97cf5c29c78debed22942435e68a81faae3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as download links, many of which point to disposable domains and are likely used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious destination by using many domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://leonvi.ru/strik?utm_term=isis+papers+free+pdf PDF link annotation
    • http://vorgazme.com/tafsir_ibn_kathir_arabic_downloadqfdws.pdfIn PDF document text
    • http://canlisohbetim.net/xawuraravito9nq7i.pdfIn PDF document text
    • http://glasshookahcatering.com/how_to_refill_playtex_diaper_genie8e42y.pdfIn PDF document text
    • http://helplnstagramoffice.com/last_day_on_earth_survival_watchtower_electric_generators17wp.pdfIn PDF document text
    • http://s7hmus.org/sipiwowawinogatubepef5eita.pdfIn PDF document text
    • http://dhl-order.info/assassins_creed_forsaken_audiobookp4z01.pdfIn PDF document text
    • http://seluluxafej.22web.org/belkin_n300_router_setup_software.pdfIn PDF document text
    • http://biweekamnf.com/wanarerilr0htv.pdfIn PDF document text
    • http://homebig.space/radeberger_gruppe_karriereportalr6nzd.pdfIn PDF document text
    • http://wonder-ita.fun/823593481071hjxy.pdfIn PDF document text
    • http://difemetudanad.22web.org/najubusopusavonuxipaji.pdfIn PDF document text
    • http://arfesopt.com/jane_stokes_how_to_do_media_and_cultural_studies8caj0.pdfIn PDF document text
    • http://pitushok.fun/bogan_movie_audio_songs_freepjh3m.pdfIn PDF document text
    • http://fibaratibe.22web.org/dish_network_packages_for_existing_customers_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://widojedup.epizy.com/magnetic_actuators_and_sensors.pdfIn PDF document text
    • http://vuripuwap.epizy.com/12369452342.pdfIn PDF document text
    • http://vuwepowav.epizy.com/31864852042.pdfIn PDF document text
    • http://bavidoripo.epizy.com/67943320641.pdfIn PDF document text
    • http://kagomovibinat.rf.gd/nix_digital_photo_frame_walmart.pdfIn PDF document text
    • http://lumaradidufil.epizy.com/takenovikibuxawudadun.pdfIn PDF document text
    • http://tadusazadaz.epizy.com/37488105724.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11004 4432 bytes
SHA-256: 14cc539f154293d77a831035b65f4e5f8c714dcf44059f0fd5daa5b1d0e66267
font_01_sfnt_off00011f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0F 11288 bytes
SHA-256: dfa76459ba66419b650c2ce443e971cfadf3f6f31a5c5a390fb9bee9d8229e2b
font_02_sfnt_off00014505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14505 16036 bytes
SHA-256: 1bbfed8e334bb90a5f9d7804257786d4ae38288f3118609b7815268b8043fba5
font_03_sfnt_off00015975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15975 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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