Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d87da7e2f02978…

MALICIOUS

PDF

80.2 KB Created: 2021-04-24 02:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 760671ffe32444d4d4ace83b7ee0363d SHA-1: 6027a25355300f7f9894f657ff171a60106b5063 SHA-256: 71d87da7e2f029786c7ac6c624c719290b28bc09c25a513b4b11a0f6d798ee06
126 Risk Score

Malware Insights

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

The PDF document uses a lure related to assembling a 3D crystal puzzle rose to disguise its malicious intent. It contains numerous embedded URLs pointing to disposable hosting services, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/strik?utm_term=how+to+put+together+a+3d+crystal+puzzle+rose PDF link annotation
    • https://cdn.sqhk.co/kepebeso/hcUghRp/95085511062.pdfIn PDF document text
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/jD3CgY0/zombie_strike_voucher_codes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/gjcjkfY/xajivijoluri.pdfIn PDF document text
    • https://cdn.sqhk.co/mutobudenit/hhwja5z/zombie_vs_ninja_1989.pdfIn PDF document text
    • https://cdn.sqhk.co/vopuvafamiw/819ihdv/auto_reply_text_message_vacation.pdfIn PDF document text
    • https://cdn.sqhk.co/rojozedofaf/bxZsObt/.pdfIn PDF document text
    • https://cdn.sqhk.co/nogupuzejewe/ieijj8a/7965313584.pdfIn PDF document text
    • https://cdn.sqhk.co/talexadu/stCghJc/home_pony_online.pdfIn PDF document text
    • http://xutexukoxobofi.mywebcommunity.org/epson_v370_photo_scan_slides.pdfIn PDF document text
    • https://cdn.sqhk.co/lazodadevab/1X4V0zP/venir_conjugation_present_tense_spanish.pdfIn PDF document text
    • http://znalomstvavip.site/how_to_start_drawing_architectureuyzow.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/bih23zG/word_worm_free_online.pdfIn PDF document text
    • http://fimewovoko.getenjoyment.net/ms_excel_2020_advanced_formulas_and_functions.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/jhgidij/bird_feeder_squirrel_proof.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/four_archetypes_carl_jung.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/ib3cgik/waguregafeduve.pdfIn PDF document text
    • http://cardio-natural.info/46re_reman_transmissioneo6yx.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/canada_provinces_and_capitals_map.pdfIn PDF document text
    • https://cdn.sqhk.co/kototokim/cggjhhc/japanese_alphabet_song_hiragana.pdfIn PDF document text
    • http://love-cosmetics.shop/the_culture_code_chapter_5_summaryflcl2.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/49f8abf3-7dc4-48af-99f6-ac26c22938b3/4472912551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22289425-6b01-4e69-a302-72f0edd3e434/what_is_ibn_in_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2b5847-fc83-456c-853e-0e5cf6ae9268/18485096789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0c0a3e-249f-4a7c-b0af-5926bb8a1ffb/55651898788.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_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 5704 bytes
SHA-256: f3b6b621aa45c1cb1c7152c5ce71d4804a9dc438d6f4e5f430eb4ec8593f90f7
font_01_sfnt_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 12156 bytes
SHA-256: d292ac4322d1786fd3a829e150fb715258938ea89cb9a0b3e2d0809cbfd593d1

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