Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf36ef020a60c2c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 10:50:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f3bbf5bbb3a218493adbc4e05f669f9f SHA-1: 6ef3896ba3450bb35e5d0d4d543558f593e6f896 SHA-256: 6cf36ef020a60c2ce151a6c56864f17d426d04f4c9a030341f662f4ec8fb4eee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/123?utm_term=dark+souls+3+pyro+build+guide PDF link annotation
    • http://xupulakikovuxo.mypressonline.com/rilodezujigufudokupik.pdfIn PDF document text
    • http://kernig.store/483048228984xsy4.pdfIn PDF document text
    • http://alternativeinfluencenetwork.net/6552800063kzca7.pdfIn PDF document text
    • https://jiwumakot.weebly.com/uploads/1/3/4/2/134235931/pimozesimubuzalil.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/070e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493550/normal_60354c0d3e9ac.pdfIn PDF document text
    • http://help-copyrighteamservice.com/57008368946rqt33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5fc5bd24552e4.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/9421119.pdfIn PDF document text
    • http://reactivaperu-2020.com/975460204647l3dk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5fd1920a9d196.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_5fd1bfd971d3a.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/jurosatugifekujiro.pdfIn PDF document text
    • http://reetodo.online/cuantos_centimetros_tiene_un_dmok60v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/31871964316.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/rubodavitirelate.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/holy_quran_written_in_arabic_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/cidco_lease_agreement_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/como_configurar_o_wireless-n_ap_repeater_router.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/sugijibus.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/96278491321.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_off0000efe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE3 5596 bytes
SHA-256: df879198c22a11dbf6e6a0d2b579f1e0b2c18bab33ca6da4c11a9f64ba2ee44a
font_01_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 10960 bytes
SHA-256: b4bf977ff56f47f2fd3bb28fccaba28197400f38f9a3faaa0e7576d7d3a6be69

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