Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc44c84ff645798…

MALICIOUS

PDF

77.9 KB Created: 2021-04-07 14:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 922e96d9036222c25e31d5206c38cf75 SHA-1: 5b688b11d0a6a421ed034f3551f1d1eb9560de66 SHA-256: 7cc44c84ff645798678c0cea32822154c0ea8020a263bb6e65488f7e8371239d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=car+insurance+documents+pdf PDF link annotation
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/1116714.pdfIn PDF document text
    • http://zoviruk.22web.org/skripsi_pendidikan_agama_islam.pdfIn PDF document text
    • https://fumifopimon.weebly.com/uploads/1/3/4/4/134464078/nijataxetinekifonara.pdfIn PDF document text
    • https://nidarefazumeb.weebly.com/uploads/1/3/4/7/134748986/655541.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/d55ed9b496.pdfIn PDF document text
    • https://vimiwakemimug.weebly.com/uploads/1/3/1/6/131606159/xosuveresezu_vomapuperodor_gedonu.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/ripoladebexifulal.pdfIn PDF document text
    • http://nixekagog.22web.org/nawamowurebugukaxikunil.pdfIn PDF document text
    • https://nikulagoronol.weebly.com/uploads/1/3/2/3/132303117/butepobamu.pdfIn PDF document text
    • http://xapozekaxo.iblogger.org/digad.pdfIn PDF document text
    • https://tefuxaforubexo.weebly.com/uploads/1/3/4/4/134446539/luvojejefig.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/mebedidupemefu_tosek.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
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_6579712fb8154f8d9e50bca0fc81f16e.pdf?index=trueIn PDF document text
    • http://jikatudito.rf.gd/computer_security_principles_and_practice_4th_edition_solutions.pdfIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_4236490188ca404795510295f031fc31.pdf?index=trueIn PDF document text
    • http://xonisuxumezitez.epizy.com/zoromuputuzojanujesefod.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_615f8bae4549489fbdfeff333540d9ea.pdf?index=trueIn PDF document text
    • http://xaxuvixefekan.epizy.com/can_a_plasma_cutter_cut_through_a_safe.pdfIn PDF document text
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_422d6874a0144f75b20dfdd855b7953c.pdf?index=trueIn PDF document text
    • http://vatujub.rf.gd/56556890220.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_dc20056160eb415fb86cb823bab5adac.pdf?index=trueIn 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_off0000e5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E1 5172 bytes
SHA-256: 8da5937aceb10171cc6563cdaff443ac6f226290d26a880567c22b28f3bbd13d
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10832 bytes
SHA-256: f1055f7d5c2af51a8639a3b6bc1434c2c29806825b288928d58a01ffcb2ce2f3
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3