Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00ed4367875bc47…

MALICIOUS

PDF

72.0 KB Created: 2021-05-09 08:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3e547b551a782e2aed6f1e9ad45a63f SHA-1: 72b061a69c258277401786e827a01ee5e402aa93 SHA-256: c00ed4367875bc4790597fc9388f02dc9400357a43365aeab9c73580b0594727
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with the primary malicious URL being https://leonvi.ru/strik. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/strik?utm_term=libro+de+lecturas+primer+grado+de+primaria+2019 PDF link annotation
    • https://cdn.sqhk.co/genamudazunu/3ia4ii6/vibenawunoreposaninizibaf.pdfIn PDF document text
    • https://damasidegiked.weebly.com/uploads/1/3/1/4/131411688/e738d7a75fb.pdfIn PDF document text
    • https://rupafiwizumuwon.weebly.com/uploads/1/3/4/4/134442684/fae43d83.pdfIn PDF document text
    • https://woxupixukuxosi.weebly.com/uploads/1/3/5/3/135316012/ac5e8.pdfIn PDF document text
    • http://zapixexarepol.medianewsonline.com/30910974436.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/topology_mathematics_books.pdfIn PDF document text
    • http://sevastopol.sale/wosipunalosojigw8h11.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/wlULjbe/94392295969.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/w2Angdl/one_in_the_same_world_war_me_lyrics.pdfIn PDF document text
    • http://lorenbayi.com/pusapozedusaxnuotv.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/mukut/interior_designer_jobs_mumbai.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/android_linux_kernel_4._14.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/5384215187.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/84009514158.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/43544213765.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/45462866935.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/83451130855.pdfIn PDF document text
    • http://wififeju.atwebpages.com/valumixozenajidedolo.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/league_of_legends_brand_guide.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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 5956 bytes
SHA-256: e6914b6e675d167bef743766c14b605f7d0f8c1f1c34db8b74fc7e2aded782be
font_01_sfnt_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 11368 bytes
SHA-256: 38b22c6233d6c6781ec6108c3ab553979ad4e5fab91eb17dad85080ffe31bb1b

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