Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f77d36c63f388d5…

MALICIOUS

PDF

87.4 KB Created: 2021-04-16 02:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4b48d96f2ff4ef6b8bd69a65a97e2ed0 SHA-1: e777f70e4c2a812f5998368696ae63bba6ae4f12 SHA-256: 1f77d36c63f388d54af8bb81ac911c09bccec2bffe0f7b5e408de64775cb2ba4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains a query about Wi-Fi connectivity, suggesting a lure to trick users into clicking on the malicious links. The primary attack vector appears to be social engineering via a deceptive document, likely delivered as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=why+does+my+samsung+tv+not+find+my+wifi PDF link annotation
    • http://in-step.shop/xapirulorosakevebasuep32x.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/Jibihih/nexabifazefiguk.pdfIn PDF document text
    • https://cdn.sqhk.co/liweruruzed/ZW7yjd8/black_and_white_neon_aesthetic_wallpaper.pdfIn PDF document text
    • http://deflecfcvy.best/xfinity_schedule_dvr_online3pasz.pdfIn PDF document text
    • https://cdn.sqhk.co/vivupedasez/if5Mjdn/soccer_online_betting.pdfIn PDF document text
    • http://cosmicgig.com/toy_blast_hile_apple7tmhl.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/Dijjijh/oscar_health_plan_of_california_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415974/normal_5ffde0cb760cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5ff53ee90c04e.pdfIn PDF document text
    • http://cmbespaceclient.xyz/dixemobozugukifisinv0p5.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/hdivagg/kogagagex.pdfIn PDF document text
    • http://dvigatel.guru/camping_merit_badge_requirement_10_answerwlqgp.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/VAgiutp/best_love_quotes_for_facebook_cover_photo.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/deweverowudowudixapavyhr.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
    • https://s3.amazonaws.com/rujabepifar/differential_equations_series_solution_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/bejovixigogigigedidop.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/suntory_holdings_limited_annual_report_2017.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_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 5340 bytes
SHA-256: ec87c6ebf5c82ae6bbce6624a5611b82a94ac18e6c405f9b753389f952a42e6e
font_01_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 11120 bytes
SHA-256: fa0eb0c2ff0e0689d5c14bed9a0c9ce21fa22abe7e9cda83a536fdc631c9e63e
font_02_sfnt_off00014050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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