Malicious PDF — malware analysis report

Static analysis result for SHA-256 925c1dcde005e1fc…

MALICIOUS

PDF

84.1 KB Created: 2021-03-30 23:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a2f17495eac5992bcb0b7bf7e4a1237e SHA-1: ed82d8ebb100eda7becbf0f5229c4695a25d9bb4 SHA-256: 925c1dcde005e1fc5cb6078914121a659b9c6084e94e188c38c741b7582a2f93
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/award?keyword=agriculture+future+pdf PDF link annotation
    • http://magnitoli-2ekran.site/442908161530y1r8.pdfIn PDF document text
    • http://ig-copyrightnotice.com/61497744145py6f9.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/xidifTf/rumolofipojezani.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/hhaygjV/buzzer_sound_button.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_601391b76ff97.pdfIn PDF document text
    • http://lilozekakotelup.sportsontheweb.net/95075905496.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/philips_system_one_cpap_manual.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/tagegetifepavogiperitize.pdfIn PDF document text
    • http://copyright-infringement.business/lelapidarurlley.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/gcMicie/the_last_remnant_remastered_switch_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5fd8d4c42e662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_604e5179aa641.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/nhiNic1/letupakew.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.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://duribolatajofa.atwebpages.com/54045527991.pdfIn PDF document text
    • http://pitowurojagit.epizy.com/unscramble_words_with_answers_christmas.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/winawexekuwamol.pdfIn PDF document text
    • http://lizaduguxo.epizy.com/guwahati_assam_weather_report.pdfIn PDF document text
    • http://mapitixonemo.epizy.com/sat_reading_comprehension_practice_with_answers.pdfIn PDF document text
    • http://zufelagek.rf.gd/rujiwod.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/flujo_de_materia_y_energia_en_los_ecosistemas_ppt.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_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 4592 bytes
SHA-256: 6d7b9b360139f422b9dcd094b26291618cf501fccbf8648febc0aa88f737805e
font_01_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 11260 bytes
SHA-256: 5b0292b10dd693d60ade50b4a11422db142dfddc63c68b0b30aa4140c0385026
font_02_sfnt_off00013540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13540 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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