Malicious PDF — malware analysis report

Static analysis result for SHA-256 595cc959d74c29b9…

MALICIOUS

PDF

83.4 KB Created: 2021-01-29 10:40:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e32ff39e4c8d0fd25975757d6e38fabf SHA-1: 2e1b679cbcceece3f8b579dfc8fbe0f729af9cc4 SHA-256: 595cc959d74c29b9fcb96b483bc584927ac567052c5ab64e18c3767a16e54b86
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a gap insurance refund notification. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded link suggest a phishing attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://yafferge.ru/aws?utm_term=gap+insurance+refund+template In PDF document text
    • https://cdn.sqhk.co/fisoxinizo/mhgijhd/fruit_shoot_tf2.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/4pGTfpm/funny_punjabi_ringtones_free_download_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/jVhbQgf/73625781365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487423/normal_5fc950603e4ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385876/normal_5fec0b7ebdc67.pdfIn PDF document text
    • https://cdn.sqhk.co/woravejafeto/Gftihjf/kadojozejikaf.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/igj42jd/lesson_plan_ideas_for_school_age.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5ff3c4bfb904e.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/npgetgj/subway_restaurants_catering_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/jwhagjh/homeschooling_free_resources_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/Bgfih7A/horizon_fitness_service_center.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378843/normal_5ff853720c3d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/purebdcraft_1._13._2.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/federal_credit_report_free_annual.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/bovolewurujetudisunoporun.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/xufatazefajirub.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/20488798267.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/251898598.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/91117709000.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/rufozitajuputedotiwo.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_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 5332 bytes
SHA-256: d55bfa7f52ca2c7aa693b83a2749c4aaea5359a2e297b41b08049743c349be25
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 10776 bytes
SHA-256: 0834070babca77f9ae63a38fd53980a5ee5296f79d93842b74a025af2ea1e045

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