Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f262ef4771ea7a1…

MALICIOUS

PDF

77.2 KB Created: 2021-05-13 18:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e6a9bbe543a30f128e894fbe80b25a6f SHA-1: 61c05db2032cbf24bed617ec5b2a06f5aa0d281c SHA-256: 1f262ef4771ea7a1788dd76ec37f7e10650400a706bd2f0917e43fc96036e8f3
186 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a link farm. Several heuristics indicate malicious intent, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, suggesting the PDF is designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=do+leo+woman+play+mind+games PDF link annotation
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/tuwelixujiri_bazifetagab_rokuvigunipulu_kiroj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463559/normal_605b53b84be95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416125/normal_6042d4550e5ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446174/normal_600edad546804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_601b04e0d1b52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fca375540073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411480/normal_60684718728d6.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/29c3a6c.pdfIn PDF document text
    • https://fifukujujaki.weebly.com/uploads/1/3/2/6/132680890/3847924.pdfIn PDF document text
    • http://finoginujowiwi.mypressonline.com/gekapumofejabokawoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_604f31bb8fe63.pdfIn PDF document text
    • https://javekulu.weebly.com/uploads/1/3/1/8/131872149/9228713.pdfIn PDF document text
    • https://godanikepogi.weebly.com/uploads/1/3/4/5/134509841/soxugolofen_tidisifugi.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/pewuwelugunobal_pulugeropi_rawige.pdfIn PDF document text
    • http://mojofaza.mypressonline.com/jagenubapi.pdfIn PDF document text
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/ruron_vufupiluxi_muwegoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_605d47b71c8fe.pdfIn PDF document text
    • http://xebupado.mypressonline.com/xuniluxasomewefux.pdfIn PDF document text
    • https://vewefididijos.weebly.com/uploads/1/3/4/5/134517371/9294413.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/series_voltage_regulator_using_transistor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5ff4a4737347d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://belojegepi.epizy.com/al_quran_tamil_tafseer.pdfIn PDF document text
    • http://kuxedas.rf.gd/bangla_hadis_book_free_download.pdfIn PDF document text
    • http://fapomotomojopog.epizy.com/dituxumufaxarev.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 5376 bytes
SHA-256: ce3e02765455f4c9691cb2f7edeb58292517ebec735d7b3ce5da4c3050bf0692
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10944 bytes
SHA-256: 6838ad8457bb41b18d35e95bc6676a0e811541910d28cc19205c743384673208