Malicious PDF — malware analysis report

Static analysis result for SHA-256 258e469862f32300…

MALICIOUS

PDF

69.8 KB Created: 2020-12-22 06:35:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b11e00fdac5a3d319301e243e4bdd48d SHA-1: 6c9065f39babc6ee7e0f470eade164691d7f89ba SHA-256: 258e469862f3230068451b8ea2c338a6ee30591ff1cda1838ea8d19c657485d1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of external links, many pointing to other PDF documents, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs indicates an attempt to direct users to potentially harmful content.

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://traffine.ru/strik?utm_term=chinese+checkers+marbles+australia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fd1649c539e1.pdfIn PDF document text
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/6409673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484633/normal_5fbb49e802e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5fbab0991630c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5f953d5cb5a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_5fbe00b918316.pdfIn PDF document text
    • https://vodipewelo.weebly.com/uploads/1/3/1/6/131637384/7016128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417306/normal_5fc8eac1d4ed9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc10c1368612547ed5ef44e/t/5fd091ef06d21916ed706f8e/1607504367824/92816728362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b2becf-3f8e-422d-a685-79d554beaac5/78468936033.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe35cf9b1ed03538a5bf80/1606301143284/wujunudemetomolesizogubon.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcfedc00f7af3919d3ecb6/1606221532921/the_great_gatsby_questions_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba4e8b41-5f0a-4f38-9240-7915ebc5eab1/.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ef9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEF9F 17692 bytes
SHA-256: 37d64634aa676e1e22e97b1e3d6b8d9918ceddaa9ff738abd09ab0ee41006f3b
font_00_sfnt_off0000bbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAC 5148 bytes
SHA-256: 95448611185d2940917d05004746f682647c3bc613535054a9da918fa829952b
font_01_sfnt_off0000ccfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFD 10188 bytes
SHA-256: a32130bcd66f93d275be38f193b46179b1e9120f82124d570b1acb96d9462fa1

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