Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e6790d536bad47…

MALICIOUS

PDF

78.3 KB Created: 2021-05-12 12:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b2e5191a86c6d8946b6934876a749b93 SHA-1: 5f3e3b8459d030ca349910b087b9c61750be3765 SHA-256: b4e6790d536bad47a9eded9d3cf287605aa99d5c6311a17f837fb582e62fffc2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to external sites. The primary URL, https://ponafet.ru/strik, is associated with a phishing lure related to 'how do you reboot a sony tv'. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it's a phishing or trojan delivery mechanism.

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://ponafet.ru/strik?utm_term=how+do+you+reboot+a+sony+tv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470218/normal_600d8da92752c.pdfIn PDF document text
    • http://myfavoritesun.xyz/kavibuxujokamidefatewevfgjyd.pdfIn PDF document text
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/zenidanejowijuzav.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/pbh_2100_re_vs_sreq0twh.pdfIn PDF document text
    • http://pro-konditer.com/rock_band_4_latest_songsg6nuu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5fd61578c3e1c.pdfIn PDF document text
    • http://funseeds.site/fog_of_war_the_battle_for_cerberus_apkus58e.pdfIn PDF document text
    • http://meinekarten.best/623276062516ce9e.pdfIn PDF document text
    • http://hotloveme.online/21601724402hr465.pdfIn PDF document text
    • http://sallehq.xyz/raxefaxapevol4ohh.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/repovefufevufosej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490375/normal_603d15c6b76ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490529/normal_601f0364763a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419195/normal_604cb6b96d99a.pdfIn PDF document text
    • https://fotofewoxa.weebly.com/uploads/1/3/4/8/134849098/b1f3022be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavigivewekudu.rf.gd/gaguwuxoj.pdfIn PDF document text
    • http://wepatimaleb.epizy.com/how_do_i_update_my_audio_drivers_mac.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_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 5144 bytes
SHA-256: 21c95fb446ce0c47f151420d24744b3c932e28de3f5c1545b2a086dd8cdb1dfc
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 11472 bytes
SHA-256: b9a6bc9e6eaa16d8a0ba7a9de47d9a0d88081cf6a0869823741a6673a51db128

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