Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35c1aa59e9016df…

MALICIOUS

PDF

70.8 KB Created: 2021-02-16 06:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0eeabd6b99e355b5828bc6d0e5fe6d8a SHA-1: 246f9686c05cb74ca5e19a4e5eab5861ac7e7166 SHA-256: a35c1aa59e9016dfcd31f6e9d307f6fb7e5e78663a0c92e745f5c68f7fced37f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to 'Verizon router admin panel' and 'wkhtmltopdf', suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the primary attack vector appears to be a phishing lure leading to a malicious URL.

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
  • 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://crophysi.ru/strik?utm_term=verizon+router+admin+panel In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413845/normal_5fe5aedb54a54.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/BQdgfJi/windows_8._1_usb_boot_software.pdfIn PDF document text
    • https://cdn.sqhk.co/bijininabex/KJhdhjh/wazofovudutiwijeduximiz.pdfIn PDF document text
    • https://cdn.sqhk.co/kigifadarija/hgie1ab/15059613053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495387/normal_6007f3a7e9d83.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/hhishbB/learn_spanish_300_spanish_phrases_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/bivaxijo/ij7Dojd/missile_escape_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_6018d9828207b.pdfIn PDF document text
    • http://zenafek.iblogger.org/37884713334.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gorevifero.epizy.com/d._f._s._c_full_form.pdfIn PDF document text
    • http://gepopimasirepav.rf.gd/template_cv_powerpoint.pdfIn PDF document text
    • http://sajusujivolase.rf.gd/first_encyclopaedia_of_islam.pdfIn PDF document text
    • http://puxugizotivevi.epizy.com/38449285574.pdfIn PDF document text
    • http://pamixawikisif.epizy.com/wopuletonatiwowusu.pdfIn PDF document text
    • http://gezozanalenebun.rf.gd/adoptable_guide_dogs.pdfIn PDF document text
    • http://siwojanapav.epizy.com/69482050200.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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 4940 bytes
SHA-256: 83b785ffd8be6218f47a857c3ca7f7ac96d1bcbe88ddc10bd8f3930b7a40e649
font_01_sfnt_off0000ea60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA60 10584 bytes
SHA-256: 6da81f5d7ed547d606653c83ed44f6de70c459b267be56ef042c33dee2fec463

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