Malicious PDF — malware analysis report

Static analysis result for SHA-256 475a5c2c1a189384…

MALICIOUS

PDF

176.6 KB Created: 2020-12-14 23:28:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f9edc4196929538702eb902669938ad8 SHA-1: 1eea1d8c1510888a045a691b243aa5af17c87fb7 SHA-256: 475a5c2c1a1893848a4f36060a63c751d8dc103b614dbd0772ef958d35a54b7f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=where+is+area+code+866+located+in+canada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482218/normal_5fc067589c889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f87633f996cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5f962d0a797db.pdfIn PDF document text
    • https://mijelowiwiloz.weebly.com/uploads/1/3/1/1/131163856/sixiwojasan.pdfIn PDF document text
    • https://wuzafonufiza.weebly.com/uploads/1/3/4/3/134341979/bofuzeralibiv_godaxo.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/wobapelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_5fc129132ef14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_5fb6036e1b1b4.pdfIn PDF document text
    • https://wisolowiguwo.weebly.com/uploads/1/3/4/6/134630140/1d4ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_5fd0df7706e43.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/fukepez/agni_siragugal_tamil_book.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a14d03f04e270fe5ad15/t/5fd65e3c313c42342b8c84f3/1607884348590/soxova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aef448fa-39ac-4e95-985e-512522973ff6/tetijasa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57c6e085bf90c0e1c1b48/t/5fc9d761fedaa13a48644e10/1607063393433/asia_empire_2027_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D80 25336 bytes
SHA-256: bc8e21f66d16b4c4bdff0e15f9665b35b3bf7d3d71b2190fd0800d9aec84ec47
font_01_sfnt_off00027caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27CAF 5388 bytes
SHA-256: 90bad1afabe2417539985d939e730fd0e78641614426f3819ba161542f4371cb
font_02_sfnt_off00028f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28F05 11260 bytes
SHA-256: 1e13c03402b9adce107db8394cfdb07f4f18be197769229df6b7cd88d6ce29e1

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