Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5ce9910d0bc5a3…

MALICIOUS

PDF

79.6 KB Created: 2021-03-25 06:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b48615f46ed1a995fea6ccc077202c4a SHA-1: 99e7fd058587622e378e50e19815eb7175d98cf1 SHA-256: ba5ce9910d0bc5a3ef622fe2147a480ba0813c362cd5045481c965e042036f67
186 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 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/123?utm_term=best+london+travel+guide+2018 PDF link annotation
    • https://cdn.sqhk.co/dutebevon/fibjjij/62011702386.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/jdahdhf/titenafizubadina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529024/normal_6010d68b7ed22.pdfIn PDF document text
    • https://cdn.sqhk.co/lirisakaxam/ismhfhc/zirivunova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481062/normal_603b8ff1091de.pdfIn PDF document text
    • http://gefosezidubajoz.scienceontheweb.net/punabiwusofepilotifuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375541/normal_5feb40654b19b.pdfIn PDF document text
    • https://kamowomol.weebly.com/uploads/1/3/4/3/134371521/87958404.pdfIn PDF document text
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/mafar-kavomepokebo-xularaji.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/igggheQ/8552729846.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/55789991288.pdfIn PDF document text
    • https://cdn.sqhk.co/bipokagiti/fia5tSu/rose_photo_frames_hd_images_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_600f1144d007c.pdfIn PDF document text
    • http://xogavuw.medianewsonline.com/speaking_skills_ielts.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/9489538.pdfIn PDF document text
    • https://gukegibulu.weebly.com/uploads/1/3/4/6/134668459/dezedoritadadapol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://palelezugob.onlinewebshop.net/spoken_english_learning_books_free_download.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5504 bytes
SHA-256: b73d957222d53de30c6fb4a684829f5fe69e28159a5bd81ca59f01b7180fb8ef
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10848 bytes
SHA-256: 9ffd96e14826c6bd99a9b18f6db3d30ed71329db4e4939715387bff148521547
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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