Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4c024a31af528a…

MALICIOUS

PDF

85.1 KB Created: 2021-03-02 18:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9ab37592cc871b99a904ad256fac627e SHA-1: 25cf3a82812081525e71d7e0383ceae7abc27d51 SHA-256: ff4c024a31af528a5ddf639af01fb43d8b1e7a9d1fdda5f0c1ac5785b7965e84
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting, and is identified as a link farm. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=examples+of+zone+of+proximal+development+in+toddlers PDF link annotation
    • https://cdn.sqhk.co/subilikiwi/hBzemQs/uci_mtb_marathon_world_championship_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/ViicUgg/neo_usd_forecast.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/TPEC6Pa/sim_free_mobile_phones_amazon.pdfIn PDF document text
    • http://gallery-shop.site/27888621214lc3i1.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/cuzAabD/30579241782.pdfIn PDF document text
    • http://wgathering.org/best_daily_devotions_for_dating_couples7wgu9.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/T3wjcgd/35869202245.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/91gcgc1/o2jam_music_and_game_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vezukefuza/zjdLX2F/pofajivibiraruzen.pdfIn PDF document text
    • http://doxisodezezaku.iblogger.org/78247724153.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/android_pay_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/lipisedopila/7DiiYEP/73003343324.pdfIn PDF document text
    • http://specialsale.info/3903251322003m9r.pdfIn PDF document text
    • http://igclienteam.com/badger_1-83a_leaking3ovzd.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://rebopugosive.rf.gd/computer_beep_codes.pdfIn PDF document text
    • http://fodiwivovekuvut.epizy.com/why_is_my_battery_light_blinking_on_my_dell_laptop.pdfIn PDF document text
    • http://sadabodavezuzi.epizy.com/imdb_outlaw_king_parents_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 5108 bytes
SHA-256: 40c7a32cd0c887cc01f9fd25cf757bb5ccfe180316f73813635187451025fc29
font_01_sfnt_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 10256 bytes
SHA-256: e3b53912ad0f94c79ad939a3036c784fc8a2dc5d746124d4129cc01618a7f89b
font_02_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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