Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4dbf0610512c7a…

MALICIOUS

PDF

75.0 KB Created: 2021-02-26 04:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8c82b6aa38f7b7636072a1934a7d931e SHA-1: e484621db3a83883a613a5faa66672a18af1c23e SHA-256: 4a4dbf0610512c7a7fc4395e6591aa75d30cf8fde069bc5443c7db51c7e3b74b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=dell+optiplex+3010+specs+i5 PDF link annotation
    • http://simcars.ru/71737796709y6osv.pdfIn PDF document text
    • http://copriyghtconfirmed.com/online_movie_ticket_booking_system_project_in_htmluw8ez.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/ggyJihb/nuvuxuzogitamobipagur.pdfIn PDF document text
    • http://vizionsmc.net/what_is_a_disadvantage_of_the_trichromatic_theory_of_color_visionsd0ru.pdfIn PDF document text
    • http://didezidise.22web.org/baramevituvemivufaxines.pdfIn PDF document text
    • https://cdn.sqhk.co/rotelizedo/6ktw0Q8/xefedanawovelavagokano.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://giwofigu.epizy.com/sesetewozakejusaribag.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/kebolerodizoxegetux.pdfIn PDF document text
    • http://vivemowirarok.rf.gd/making_tax_digital_xero_guide.pdfIn PDF document text
    • http://jagakemiwowinig.epizy.com/nonijute.pdfIn PDF document text
    • http://tenasupufowok.epizy.com/nililizotetupanowulibuxi.pdfIn PDF document text
    • http://mokineso.epizy.com/62805094578.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 4852 bytes
SHA-256: 05cfc36e42e14e85e7f15d7c2cd153ce5a4ed6fd3825808ade351f66979efe63
font_01_sfnt_off0000eb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB32 11176 bytes
SHA-256: e247457b6571760fd3e2556371cd2aeecd93719207d5c832f8a6615c68b9f403
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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