Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbe6f1bcbbd240f…

MALICIOUS

PDF

67.3 KB Created: 2021-02-14 23:08:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1272dd85da0b5e58b003dc4ca919dc69 SHA-1: 6a0ed3b24bd7e3bd4fc16f4d5b1377ec6287fe02 SHA-256: 7dbe6f1bcbbd240f6054effe229aa9c9825a57bac739ef27a7d6e0af94b91818
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting further supports a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

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://crophysi.ru/123?utm_term=mill+ridge+primary In PDF document text
    • http://lnstagramcentre.net/pokemon_omega_ruby_citra_android7tp1o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464878/normal_60132af3f0e29.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/iigjhgc/81967995639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480581/normal_5fe0ba343a51d.pdfIn PDF document text
    • http://vinnipoh.space/rti_application_format_in_teluguhamgr.pdfIn PDF document text
    • http://keep-travel.com/25571435162v1bwd.pdfIn PDF document text
    • https://ruvararet.weebly.com/uploads/1/3/1/3/131398095/mivedozepezenaz.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/Ubibgc6/69438053940.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494891/normal_5feea050f41c4.pdfIn PDF document text
    • http://juzajikadig.22web.org/matovusotoruju.pdfIn PDF document text
    • https://wadodimimilupe.weebly.com/uploads/1/3/0/8/130873890/vokerajote.pdfIn PDF document text
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/5374613.pdfIn PDF document text
    • http://joteruzawareba.iblogger.org/lacerte_tax_planner_user_guide.pdfIn PDF document text
    • http://kelnoteres.xyz/android_software_update_troubleshootingbhhxq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gimapetabotoza.rf.gd/wikezumuberuveg.pdfIn PDF document text
    • http://voruluju.epizy.com/agri_admission_form_2018.pdfIn PDF document text
    • http://vosimamasi.epizy.com/wavunamonoju.pdfIn PDF document text
    • http://vajexakatozezal.epizy.com/98901456113.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_off0000cadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADD 5208 bytes
SHA-256: 93743bc400dcf465aa3c2b1358940cfe61589b0cf5bf41c57685091b5db5e1a7
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 10552 bytes
SHA-256: 4d20ae7eab0f4dd4a991d5720ce15dd618ac4d51ba60a6125c8cfffb7b22284c

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