Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf64a6428eb1ec1…

MALICIOUS

PDF

78.5 KB Created: 2021-03-02 20:55:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7669398ab71841c99ceda838bc1847e6 SHA-1: 28d61e53db860a0f244afc0375b565e93bf69fee SHA-256: 3cf64a6428eb1ec157e2d4f87a74ea7dd306513b17135b0b1561ac35018a5fa4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm with numerous external links, many hosted on disposable domains, designed to redirect users to other sites. The document body presents a seemingly innocuous search query related to COVID-19 to disguise the malicious intent of leading users to these external resources. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

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://zajinet.ru/award?keyword=how+can+i+get+my+driver%2527s+permit+during+covid+19 PDF link annotation
    • https://cdn.sqhk.co/zevukodixu/6CFhdii/remix_os_player_download_for_pc_32_bit.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/iapijCS/poutine_meaning_in_tamil.pdfIn PDF document text
    • http://pawaridifos.iblogger.org/mazda_3_auto_manual_mode.pdfIn PDF document text
    • https://kubasujile.weebly.com/uploads/1/3/0/7/130776158/fezofidetipe.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/56SrDMa/eagles_greatest_hits_vinyl_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460243/normal_6005fbdd270ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_601b13206f3d1.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/6896518.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/zedoxikonuwoda-ritibo-kepuwaduni-gikisejizefa.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/ehcgejf/pixel_launcher_android_10_apk_xda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504922/normal_5ffe440e3d1f8.pdfIn PDF document text
    • http://women-ita.space/2nd_grade_symmetry_worksheetsnayxy.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/fcfd29.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://papagasevorikaz.epizy.com/50443376545.pdfIn PDF document text
    • http://wigelasipop.rf.gd/angular_template_injection_payloads.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_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 5700 bytes
SHA-256: f964f59a4f9f7026406b3f112ef86d8cbd6defbd726818e8a4ce74f4f7e7dbe4
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 10660 bytes
SHA-256: 4f6376931d75bbffedc73c0fce7d94e6be38376e3ca6401dded5a4005b43e027
font_02_sfnt_off00011ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED2 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

Open this report in the interactive analyzer, or submit your own file for analysis.