Malicious PDF — malware analysis report

Static analysis result for SHA-256 775ebbd3b32cc320…

MALICIOUS

PDF

80.5 KB Created: 2021-05-10 13:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eff20bdc30cf3e006e8f396325e6b8ae SHA-1: b021411d0f06c878bb40601a8e19534ab31c9f70 SHA-256: 775ebbd3b32cc3201f55be321b27738b9f20eababf73bdb3971a9540a0d3f632
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, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though truncated, contains text that could be used to trick users into clicking on these links, likely to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=valentine+message+for+little+sister PDF link annotation
    • http://jebifawulu.mywebcommunity.org/beginner_teacher_s_book.pdfIn PDF document text
    • http://sacredname.ru/flying_car_transport_simulator_mod_apk_hackezbt9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_6045111d4e8d1.pdfIn PDF document text
    • https://cdn.sqhk.co/wevemugas/ifjjjhS/98903261859.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/dJCiggh/lejik.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/kosikirovofiwixifafufu.pdfIn PDF document text
    • http://bizbize-yeteriz.org/smart_bracelet_how_to_turn_on_bluetoothwnq9m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_605919fb22226.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/5jbXhcu/armor_mod_minecraft_pe_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/gifexajed/9pDibqO/self-_guided_whiskey_tours_of_scotland.pdfIn PDF document text
    • https://cdn.sqhk.co/kulamogo/efBidgc/raceroom_racing_experience_track_list.pdfIn PDF document text
    • http://bifozitixexidad.mygamesonline.org/zelebikutidog.pdfIn PDF document text
    • http://jegexovavof.iblogger.org/14588066081.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_60612f16ed9ec.pdfIn PDF document text
    • http://numulul.mygamesonline.org/55813068329.pdfIn PDF document text
    • http://grandov.pro/fobatiguvisisifegoluxago69bx9.pdfIn PDF document text
    • http://neyroskakalka.site/download_mini_car_racing_windows_7nbsmb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_60265068b8c8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tupofelasujewas/20067072561.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/46575873509.pdfIn PDF document text
    • http://runoxujozu.rf.gd/arcsoft_photostudio_2000_free_full_version.pdfIn PDF document text
    • http://rudufegasavu.rf.gd/bumblebee_transformer_cardboard_costume.pdfIn PDF document text
    • http://dijutago.rf.gd/nokokalo.pdfIn PDF document text
    • http://bugekumenun.rf.gd/90055421508.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/aur_pyaar_ho_gaya_episode_235.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_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 5052 bytes
SHA-256: 6255105418d8b4c748dd5552f11672bb0016860e15491cccb1224f51038e9e6d
font_01_sfnt_off00010d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D86 10924 bytes
SHA-256: 67a9d8dc32b0e688dfc2b392e7be4ff6eb021a4bddd1c07b8eb11a58eca01f50

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