Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4676ec01c26de9…

MALICIOUS

PDF

81.4 KB Created: 2021-03-17 18:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9a86ed8f7661e2df312b4c69ebd7820f SHA-1: ad130374b97ffabd2074eeb8af18d22eb2944fcf SHA-256: bd4676ec01c26de9aa523056ed376d688349591b095fc3ea6caa5216efd86c14
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used to distribute malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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/wix?keyword=mr.+boston+official+bartender%2527s+guide+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4462986/normal_5fe760cce3599.pdfIn PDF document text
    • http://niwimimotejus.iblogger.org/how_to_draw_a_face_shape_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_600d978623af4.pdfIn PDF document text
    • https://zatiwakap.weebly.com/uploads/1/3/1/8/131871625/wofupa_tonemumox.pdfIn PDF document text
    • http://foruzakitotilut.iblogger.org/rizorugisad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_60385666a6b85.pdfIn PDF document text
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/42b05eaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fee888ecbd73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_600e9f29a2c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fe66fed203c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419847/normal_602404ac18a17.pdfIn PDF document text
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/vimigazapisun-valiwomonolu-mofabaz.pdfIn PDF document text
    • http://rawuzexo.iblogger.org/neduluvafuzosovusugarata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383572/normal_5fe359639291b.pdfIn PDF document text
    • http://nelitip.22web.org/certificate_of_authenticity_template.pdfIn PDF document text
    • http://megivisu.22web.org/verezamimutaxugemasana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_602f3e524e9f5.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/9963ef6e-7ee1-4d93-beba-903d373f855f/how_to_connect_home_theater_system_to_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1e314e-4125-43a9-b50f-f89c24030904/nizobigidasumud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9977d6a5-182b-4a17-82e5-b76e6c39829e/laxowodab.pdfIn PDF document text
    • http://fukukulaz.rf.gd/jojapideremesasosuwimogo.pdfIn PDF document text
    • http://loxosufodu.epizy.com/gujevofusabav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab2aa42-77f5-4d33-bb3b-76c36ce69c59/juzadiremad.pdfIn PDF document text
    • http://pomirunorejuso.epizy.com/ap_biology_exam_review_answers.pdfIn PDF document text
    • http://gedatedemokuju.epizy.com/45310351717.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_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 5536 bytes
SHA-256: 31fce8161ef4ee0c64abf29e7a8a7226618fa2171a300f30f3266100705cdeaa
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 2452 bytes
SHA-256: 0f0ed770d3db98d93b74b9621c7aa73924cd6c5630607688f8ebab9d2ec3a78e
font_02_sfnt_off0001100f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100F 11040 bytes
SHA-256: 9ab9ee00d397c902340c2b04309429f120344d41dcdbc24962818b89825b6c40