Malicious PDF — malware analysis report

Static analysis result for SHA-256 939760b2b7be8e0a…

MALICIOUS

PDF

68.4 KB Created: 2021-01-02 18:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 090409545cc1117e7a3847683d4f6f21 SHA-1: 6a29ccee1e92e503073d7a9a7a904b7893689784 SHA-256: 939760b2b7be8e0a94d8b7fd772620b3809f84d40bd1c9470308b9712ed36736
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of the primary external links is to 'traffine.ru'. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or a link farm. No scripts were extracted, but the structure suggests an attempt to redirect users to malicious or deceptive 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/123?utm_term=kobalt+impact+wrench+3%252F8 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5f8bac5719f5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500911/normal_5fd82380ad595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497646/normal_5fe3de8137562.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424341/normal_5fe2374700af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5fae301036212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5fa26e01cb54d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5fd788a213a81.pdfIn PDF document text
    • https://sirususi.weebly.com/uploads/1/3/1/4/131407567/2514567.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbacbfdc-a4e1-4e94-afed-98ba1d62206d/minimum_spanning_tree_worksheet_answ.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/vowekuwedozotapodafares.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7fa639f-9db9-4616-9d85-c4256b50124c/5653154661.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/cyberpatriot_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91b0b8e-aee5-4413-a8cf-e5d12a06241d/serpentshrine_cavern_entrance_wow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85b1bc0-4f89-4d90-ae77-e99dcc62a036/kkh_sabine_lavalle.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 5592 bytes
SHA-256: 88b0df0e12a3e6b4799b3e5d17a0c9b0ca56d5f8c5467789ab7eca7f815ec5e3
font_01_sfnt_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 10304 bytes
SHA-256: 7f81a59c97c6865fdd3dfbd22df868720230346b517c211f36ce230e35332ff2

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