Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b9360ada028539…

MALICIOUS

PDF

80.2 KB Created: 2021-03-22 05:02:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bb4637ef4876e32250ee3909201597b0 SHA-1: 27e218ad7bd97ceb10ab27190af5fdc4db1652ef SHA-256: 81b9360ada028539f9a96d3caffd9ed1f84c7c520fee098ec5e55fea03c0fc4a
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of a URL with a 'keyword' parameter indicates an attempt to mimic search engine results, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://pelibifir.ru/wix?keyword=xfilmywap+bengali+movie PDF link annotation
    • http://nelilovodik.scienceontheweb.net/guitar_chord_book.pdfIn PDF document text
    • https://fafotarume.weebly.com/uploads/1/3/1/0/131069904/mavazu-webivaz-japozevesopevi.pdfIn PDF document text
    • https://xufevojulan.weebly.com/uploads/1/3/1/3/131384667/fepibibebumob.pdfIn PDF document text
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/jebebuv.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/fepojiraragewugejuvo.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/8562378.pdfIn PDF document text
    • https://bixedonaxube.weebly.com/uploads/1/3/4/6/134619794/4199794.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/xakulijibuwanosobeg.pdfIn PDF document text
    • https://punoburewi.weebly.com/uploads/1/3/4/3/134305970/4932929.pdfIn PDF document text
    • https://buzoraxuv.weebly.com/uploads/1/3/4/3/134366179/7914350.pdfIn PDF document text
    • https://zixobidepupakog.weebly.com/uploads/1/3/4/5/134503699/f9f91.pdfIn PDF document text
    • https://getivafet.weebly.com/uploads/1/3/5/9/135960962/308414eeaa.pdfIn PDF document text
    • https://dukopovofozevi.weebly.com/uploads/1/3/5/2/135295758/xotali_difisavarojo_govokesibixaj.pdfIn PDF document text
    • https://defupaga.weebly.com/uploads/1/3/2/6/132681490/mixubumopux-jojibupuz.pdfIn PDF document text
    • https://kakejomoweva.weebly.com/uploads/1/3/4/6/134674311/duborugamizi.pdfIn PDF document text
    • https://vufupobuzalezu.weebly.com/uploads/1/3/4/8/134853030/wosorek.pdfIn PDF document text
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/1322b022.pdfIn PDF document text
    • https://bujopulima.weebly.com/uploads/1/3/3/9/133997272/fijavupojadejel.pdfIn PDF document text
    • https://kuxodebareku.weebly.com/uploads/1/3/4/0/134042390/49889.pdfIn PDF document text
    • http://rezumitisud.mygamesonline.org/54899287352.pdfIn PDF document text
    • https://dirututusobed.weebly.com/uploads/1/3/5/3/135347210/7305953.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://rotufixijisadi.onlinewebshop.net/customer_accident_report_form.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/71744100255.pdfIn PDF document text
    • http://dajomilot.atwebpages.com/78113907052.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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 5024 bytes
SHA-256: 6557a654ceec6a423bc739ae30c482ad388bf4a46bad4ae6f1184c871a7a8f66
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 10060 bytes
SHA-256: 8091c83a900781c153610c6c34603d8b7a36c19335854e24d9e3d0dadd2df49b
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230