Malicious PDF — malware analysis report

Static analysis result for SHA-256 9949c42b8af02e28…

MALICIOUS

PDF

86.4 KB Created: 2021-02-07 11:33:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 371ddc26a94486bf8f4f0e24a8d0488c SHA-1: 77065459f142605c047b3b49440c105868879fcd SHA-256: 9949c42b8af02e2862161fb9926062318ba10cc9bb7b0492f5a1fbd89fbf13d8
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/square?utm_term=uber+data+breach+case+study+pdf PDF link annotation
    • https://lujotasapamuxa.weebly.com/uploads/1/3/0/9/130969194/redubisaturuvedo.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/18cba7.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/0d05a1aabc34d.pdfIn PDF document text
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/xazumajanibubixofi.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/luic5gf/heroes_charge_2020.pdfIn PDF document text
    • https://tebifuwufarul.weebly.com/uploads/1/3/4/8/134886387/5133325.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/jd6ier8/64243412445.pdfIn PDF document text
    • https://cdn.sqhk.co/xanodujijefu/TfG74It/environmental_studies_summer_programs_for_high_school_students.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/2dfb430eca6029.pdfIn PDF document text
    • https://guleritep.weebly.com/uploads/1/3/1/3/131383493/finawukapiko-viwemudijobit.pdfIn PDF document text
    • https://gifolavetufo.weebly.com/uploads/1/3/2/6/132695571/909886.pdfIn PDF document text
    • https://cdn.sqhk.co/xiponamoribo/ifkBggN/turbo_racing_3d_car_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wumigapinido/djhzMDb/zodifigo.pdfIn PDF document text
    • https://gawuwusirijer.weebly.com/uploads/1/3/4/1/134108670/kabojokezenoz-malewo-zapakoso-nawidu.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/zizunowekufeki.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://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_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 5064 bytes
SHA-256: cb5e06c3a934edb9bb234bb58b9cd4336e1c0ea6c43cffeac517bdc9d2d33f0c
font_01_sfnt_off000117fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FD 11280 bytes
SHA-256: db507f51b0bc4081170570918bb8c60ebc45e3a4f4fda6500696f13bb361049a
font_02_sfnt_off00013eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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