Malicious PDF — malware analysis report

Static analysis result for SHA-256 a737cdc0232c1313…

MALICIOUS

PDF

77.5 KB Created: 2021-02-21 10:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c780ca64067857743128974800e8b349 SHA-1: d624252c9634f4c0a05dc4c01a32756c327fc29f SHA-256: a737cdc0232c1313240dec69a85f6f7b8560d00630bf2f224367683bff0e5206
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/wix?keyword=2001+ford+mustang+repair+manual+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369775/normal_601be26ff09b5.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/ijdjjhf/97798196979.pdfIn PDF document text
    • https://bulobazopikiju.weebly.com/uploads/1/3/0/7/130776241/detamudubapogip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473415/normal_603029f764ee2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383795/normal_5ffae0e726f89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_601474ab8b04a.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/jahdjfa/82134952550.pdfIn PDF document text
    • https://zuxusesomopekem.weebly.com/uploads/1/3/5/3/135305840/1490744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_601d941ee67fa.pdfIn PDF document text
    • https://xuzabuteke.weebly.com/uploads/1/3/1/3/131379980/7541502.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_600a43d0052e5.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/pulujolatepuv/present_perfect_continuous_exercises_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/62497497831.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/nasuni.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/bansidhar_ka_gana_dj.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_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 5592 bytes
SHA-256: 7dcf2b9f1038cbaed5a3bc1d3a1eb00e43316687e4ef81ba6e6505668cebd118
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10288 bytes
SHA-256: 52074c5be6ce7a5eaec0687a5ce8adaad8fbf65b52366c46bf12a3fe51c5fb05

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