Malicious PDF — malware analysis report

Static analysis result for SHA-256 045b9082f8d5b0f7…

MALICIOUS

PDF

76.4 KB Created: 2021-03-16 18:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5835ebef9552b01aac58196d35890cf0 SHA-1: 9b032b318209bac9b3a6cf0f693d67d96d738548 SHA-256: 045b9082f8d5b0f74ef24913dc0c64bc185d7eabc9a62a37dbc2c016bbbaa854
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites, potentially leveraging JavaScript for exploitation.

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://jottigo.ru/award?keyword=carpenters+music+sheet+pdf PDF link annotation
    • https://cdn.sqhk.co/wopeporamo/gi8igjM/15985184232.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/cXjhiha/blockchain_wallet_dashboard.pdfIn PDF document text
    • http://crubr.space/angelcare_babyphone_ac_401_bedienungsanleitung_downloadj6kvg.pdfIn PDF document text
    • http://poverkavoda.website/potepexokufimuzufeva1nege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_6037a79ac157c.pdfIn PDF document text
    • http://vzroslyh.net/86009659728cq0h0.pdfIn PDF document text
    • http://hookup681.site/nursing_theorists_and_their_works51ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404107/normal_5fe365d836a58.pdfIn PDF document text
    • http://podarokinsta.site/dell_u2711_max_resolutionunil5.pdfIn PDF document text
    • http://50off.pro/unravel_me_kendall_ryan_read_onlineta78q.pdfIn PDF document text
    • http://pedron.fun/what_does_the_rising_sun_mean_anzacqiems.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5feb4a2a2e9e8.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/cQOicic/nupuli.pdfIn PDF document text
    • https://cdn.sqhk.co/pisomuma/phdoT4P/77610284798.pdfIn PDF document text
    • http://expressday.online/131751582490r0fv.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/sefepugolupalax/acute_otitis_media_guidelines_canada.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_9d2f41fb81f3407091d89c285738f928.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_29bf2b99a7b241cabd376411b24f931a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/kpop_idol_quiz_2018_answers_level_19.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/wondershare_video_converter_ultimate_free.pdfIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_23aed8c737b048e7899c01145a05a84f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/butterflies_rising.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_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 5268 bytes
SHA-256: 10d94c79b17dfcf38aefbc9f1f39434640a7c6113354b75d13e70acd0f761209
font_01_sfnt_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 10748 bytes
SHA-256: f7d408432d1cc59ffe87faf47c70b2276a86af0695d6f685a95d8b612642adb1

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