Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ef9bdf5173f7a8…

MALICIOUS

PDF

71.9 KB Created: 2021-02-19 22:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7e72768f62741e140af962dc30e46b46 SHA-1: 9fb566a1cb997bd7af7618e27380272f64e379d8 SHA-256: 87ef9bdf5173f7a87298d1d650abff05f217a9ce593e996018ebdd2d61cd3591
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to malicious or deceptive content. The ClamAV detection and ML classifier also indicate malicious intent, specifically flagging it as 'Pdf.Phishing.Trojan'. The embedded URL and the link farm point to suspicious domains, likely used to host phishing pages or download further malicious payloads.

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
  • 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://maypoin.ru/123?utm_term=what+is+3+phase+power+supply PDF link annotation
    • https://cdn.sqhk.co/soxuvezosapa/9uGhaMQ/nosekezolafesetotovizonob.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/xigovovem_revepuzuwitipu_wotasukagilet_luronirat.pdfIn PDF document text
    • https://tojumemi.weebly.com/uploads/1/3/1/3/131379390/e16ca3f3363b5.pdfIn PDF document text
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/fa8bbf24649.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/WhfKbjd/bujuvoresera.pdfIn PDF document text
    • https://xunitaminovo.weebly.com/uploads/1/3/5/3/135349323/xolenufuv-zosegosuwi-gogoboxipole.pdfIn PDF document text
    • https://dexuruxewiripo.weebly.com/uploads/1/3/2/6/132682754/2618641.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/pibabopuduj/zawuwapol.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/newawovipofevujamaz.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/what_is_the_cube_of_144.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/riesgo_ergonomico_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/print_australian_passport_renewal_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/rajegawaxuvile.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/affidavit_format_in_marathi_language.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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 5276 bytes
SHA-256: c2b49ecca4fa3bf6d6bcd9e5f4c7f9cbdf3d6d0b5a008fc61a7aae503faafde6
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 10676 bytes
SHA-256: cb35ea35412dc0ee123f98482d86e164e8617249ede669b84b5e857fc5684746

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