Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdfe0323c792644…

MALICIOUS

PDF

61.9 KB Created: 2020-12-21 05:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c7662db16bd945cf664fe00320487e09 SHA-1: 9c242fc1d1859a9fbac32810125ee9b5b9d2c27f SHA-256: dcdfe0323c79264418fec3597a3a26a1fce95058ccfd52abe202d9ab253576b1
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 0.9996

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://trafftec.ru/123?utm_term=vocabulary+level+d+unit+4+answers PDF link annotation
    • https://pokotozumunas.weebly.com/uploads/1/3/1/4/131453498/zopopugatavi-xirilak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_5fc31a76715e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5f9f1f7e17218.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/tawolotuzazerez-lutorudomikudod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489052/normal_5fa8cc8cafa82.pdfIn PDF document text
    • https://widunamaki.weebly.com/uploads/1/3/4/8/134886597/sexoju-sixurosugolivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480755/normal_5fbb978f150ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f9569c7c963f.pdfIn PDF document text
    • https://fozivumi.weebly.com/uploads/1/3/4/7/134761275/2327853.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/bidivo/vabananusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d111864f-ea91-47ac-902c-51353527eb11/38426008617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c54d0a8b-95bd-4f38-908c-53146c79a614/peebles_clothing_stores.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/mewerove.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_off0000b69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 5380 bytes
SHA-256: 954391d756b767f66439d53746747c126432ea65f09d362e6c9033d5d0c3cdbb
font_01_sfnt_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 10072 bytes
SHA-256: c16f7525c367f6407e28d99f8e8644fe17c8d62aea97a04c9318be62240db3a9

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