Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb38218bba77fd15…

MALICIOUS

PDF

79.0 KB Created: 2020-11-27 23:56:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 050d96d9f2b35164635c32beaff369a7 SHA-1: de874273a50a463af0a2ee67b7e11ac04d8bb3a7 SHA-256: cb38218bba77fd153762eba9a8705244114bb39a3f65891b762f9fa845347337
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://traffnew.ru/123?utm_term=rice+supplemental+essays+2021 PDF link annotation
    • https://satatemusuk.weebly.com/uploads/1/3/4/3/134311800/nasesom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_5fb773770d9ae.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/domemik.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/xivow.pdfIn PDF document text
    • https://pivewunakunajuv.weebly.com/uploads/1/3/4/7/134770464/sawujude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384299/normal_5fb5c3552cde8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f9ea72eb6c18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_5fbd1e9f02008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f8f9b2d1daba.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/6a58c2d0-533b-4661-9673-12b78a564919/ziweliz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1819e86b-d1f6-437a-987d-596d61a5dd88/pogononegiteketejogami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e62d5e-6668-4128-968c-92fcfe6e0f7b/64877851746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d18bcd-a8a4-4913-8794-250805ec96f6/siferodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a324f940-19cd-412f-b586-9097ce590cf7/django_unchained_english_subtitles.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_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 5420 bytes
SHA-256: 3b4dd281b7b238e820da4e33927ff5a4792f77906acd351fe368dd3a2b5cef94
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 11508 bytes
SHA-256: b8044d05448164d6ed56e3bd477fb9cff19b1eaf27c188191ee7fbe6aac1a094

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