Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdbc2f37c050d84…

MALICIOUS

PDF

60.8 KB Created: 2020-11-30 18:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 60e504123cadbcb1bffe8a48d398737a SHA-1: 92d376981ef1272d782f8d45792161b72a650a00 SHA-256: ecdbc2f37c050d84eacb3afb3d6c3186b3562851c1fb41a77b0ac08360acb29c
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 0.9995

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=halloween+costumes+zombies PDF link annotation
    • https://vusuvorolom.weebly.com/uploads/1/3/4/5/134501440/d4f46ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5fc3a4b5775a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fad3e0ec189f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486537/normal_5fab8f1592541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_5fb868d537960.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/nipomomuka_gisotufeje.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/memul/one_fish_two_fish_red_fish_blue_fish_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc07d836b97992eb55a0df7/t/5fc405609ee0f32b87d0c372/1606681953512/nubugizajuvewepitot.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c55440f1034a5ca82015/t/5fc46883145a8629dc3df72b/1606707333150/armenian_english_dictionary_online_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f2f6c89e1c4b8fbea157/t/5fc16f253f75b166430a8601/1606512423602/60765900544.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1a18fea4a794d564a4325/t/5fc342a8bc819f1cf4424208/1606632105881/song_cry_lyrics_yeonjun.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d650403f5353fd956949/t/5fc1e8cfe6d49a06bbd7890b/1606543575003/52468843151.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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 5092 bytes
SHA-256: 20b270108366a491607033c72b10ba1382c81036d67d48b347f1604336b19857
font_01_sfnt_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 9896 bytes
SHA-256: ab307783b44b9613d5370912b0189b2589e01855e7e62909be76a13878eb6c0a

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