Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2bd8ba983211f5…

MALICIOUS

PDF

85.2 KB Created: 2020-12-02 00:47:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 46ac646abf75b6965b4e2594fa8b9c81 SHA-1: b47ad3756679de9a2eaa11e895dccdef38e91082 SHA-256: fb2bd8ba983211f538483a912bd1493c542a5e0f42159efd1130567ed0a7fa8e
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of multiple links to disposable hosting services further supports a phishing or malware distribution scheme.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=mississippi+speak+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5f91388bf061b.pdfIn PDF document text
    • https://wogivanozo.weebly.com/uploads/1/3/4/5/134586267/7bc8937d7.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/91ac53f085330.pdfIn PDF document text
    • https://rigagebefizo.weebly.com/uploads/1/3/4/6/134631069/gutida_kodeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_5faee0f667be6.pdfIn PDF document text
    • https://jijubukaxujofi.weebly.com/uploads/1/3/4/8/134892288/6106018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5fbc1bf94f60b.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/zajadota_terovefoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448976/normal_5fb81e8031436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487206/normal_5fc27d6be5e33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f8a1b5578fd0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd13a2f7819f6264dcd7fd/1606226850970/woziraz.pdfIn PDF document text
    • https://s3.amazonaws.com/mewezekilafef/construction_simulator_2019_download_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xebareto/app_for_showbox_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/26611473383.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_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 5036 bytes
SHA-256: 0a94a1612ef80b6f2edb5d5d31e331d1d4d02923a0b97aea46d862c840c0fd9d
font_01_sfnt_off00012492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12492 10296 bytes
SHA-256: c198a70cf5cd7fbd9a5f2a16c30a27bbb2dcea40e4fb7b371cdd30110fcbb04a

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