Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0dc015fc8b6edfc…

MALICIOUS

PDF

68.7 KB Created: 2021-02-06 01:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 73d6a912be347e91ad38ee2ec4bd3f2e SHA-1: a8003caae329208835700c46081a505b5fb6d8d2 SHA-256: d0dc015fc8b6edfcd686b00cf1fad7bcc1734609dbcef3c74828af0ac12a6d34
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains and link farms, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to drive traffic or manipulate search engine results, potentially leading to malicious downloads.

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://baarspo.ru/wb?keyword=active%20and%20passive%20voice%20pdf%20test PDF link annotation
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/5217829.pdfIn PDF document text
    • http://shtangelkipokupkiitd.online/91960485910r5hj9.pdfIn PDF document text
    • http://gejejok.iblogger.org/denutod.pdfIn PDF document text
    • https://majuxakitififez.weebly.com/uploads/1/3/0/7/130738909/dudewavevivunetafej.pdfIn PDF document text
    • https://pomonomiwubexi.weebly.com/uploads/1/3/2/3/132302815/4969861.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/karew.pdfIn PDF document text
    • http://yarrebitteh.online/ingenieria_mecanica_dinamica_14_edicionr4gq3.pdfIn PDF document text
    • http://midumadataresut.66ghz.com/boombox_ft_teni_i_dey_lyrics.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/6593899.pdfIn PDF document text
    • http://fartook.online/libitasubipejibimavevu1fsj1.pdfIn PDF document text
    • http://navalny.design/show_asterisk_password_androidtwm91.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/jakinisoki.pdfIn PDF document text
    • https://xutativapejan.weebly.com/uploads/1/3/4/5/134521393/4691391.pdfIn PDF document text
    • http://pijakonojimuw.iblogger.org/92163770808.pdfIn PDF document text
    • http://pujesuwidiw.22web.org/potuzarinow.pdfIn PDF document text
    • http://amaryllis.space/nogosipoxadi742x4.pdfIn PDF document text
    • https://kavezebox.weebly.com/uploads/1/3/0/8/130814004/vawilukafi-loxovekimutula-fikelisobut-vazevap.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/zokurujeralul-xakowij-boregiwosu-jokus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sirilamezowi.epizy.com/datimedetelulujose.pdfIn PDF document text
    • http://varaxekewuveza.epizy.com/controlled_substance_use_log_sheet.pdfIn PDF document text
    • http://faxipobusevive.rf.gd/balew.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_off0000d014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD014 5068 bytes
SHA-256: 8209369c93bf39187c4c54bd16c0e7c084ffa1877e76757d237846dcb6a7410b
font_01_sfnt_off0000e178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 10636 bytes
SHA-256: 299edb775ed523978a5083ae28d0e7889036fc3fc9882919df1d6f9990593bc1