Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9341cdaee2fbd32…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 21:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d44e2bb111342728d7f5adb9d66ea26d SHA-1: d71051c48a560db9f8793a7d336265675313ff92 SHA-256: f9341cdaee2fbd32fa0c066ea90cc2aff38dee4f86b6a137efe4aa4a5f65cb98
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=colegio+de+profesionales+de+enfermeria+de+puerto+rico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391340/normal_602d1ef631c46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374984/normal_6049afbf14d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403429/normal_601c0524b3f5b.pdfIn PDF document text
    • http://natalonofawoba.22web.org/talidemegazufiriwuvomuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_602e43fbd3512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_6057011503ac8.pdfIn PDF document text
    • http://tevazodufo.iblogger.org/5307318640.pdfIn PDF document text
    • http://gonugotez.22web.org/antivirus_software_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368955/normal_5ffb58cbcbdea.pdfIn PDF document text
    • http://buvevevonukaxe.iblogger.org/lepogubif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fc73bab46917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_601fb6d0c3c32.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://navenogu.rf.gd/the_exorcist_book_characters.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_be0b4a7dca154417bc6c4cf104e81ce4.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_625b316ac04c4588b952b24e43ee3899.pdf?index=trueIn 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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5380 bytes
SHA-256: 6288e1e4792ff4b6381e996408b956a34e724bb37e4d853f09bebba6674c29d1
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 11056 bytes
SHA-256: 3ab6aa479b60dfe457b322551f60dd2d7d5da25c03bd40a64b5b38b638191fc8
font_02_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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