Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e22a40368e6a37…

MALICIOUS

PDF

79.9 KB Created: 2021-06-02 08:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b098a41bf19ab236a7955c0f22ead689 SHA-1: 1776079a08a804e15815cdb394c576b5afa55513 SHA-256: a9e22a40368e6a370508a7eb16e9855d4fd8d9808d4140deb41bb13dce3144d2
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 0.9997

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://botokaw.ru/123?utm_term=free+business+letterhead+templates+doc PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4382960/normal_60b7105e74392.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413851/normal_5ff54f0aeda34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_60031b927c131.pdfIn PDF document text
    • https://gusemotasejodab.weebly.com/uploads/1/3/2/7/132741535/7259761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_604bc48ad6ea0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489740/normal_5ff9bed77a84b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_6068b50b7092a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383929/normal_5fc6a81aa0f0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_60550f4243f57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422894/normal_5fcc52f932fa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_601ba6b78df67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450512/normal_5feb4c6725a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478148/normal_6032356ad8aeb.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/fewijeluwujolubad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_5fd618e2e49b1.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4391326/normal_60b51308d17fa.pdfIn PDF document text
    • https://kesizizuju.weebly.com/uploads/1/3/4/3/134384541/zifedufobutelaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403406/normal_5fc8dcf2ecc37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501231/normal_606244b5a0036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468871/normal_5fc593f7db8ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_6016c3a216889.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 5408 bytes
SHA-256: ca293bb897e9bdc78505c235380b644331a8451d359b587d1153bc1f9c5e99a3
font_01_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 10636 bytes
SHA-256: a0e992f29b04b15bf07f87684ee6e98e7d1a1c6f72dfb8263bd87ff18bba0c2e

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