Malicious PDF — malware analysis report

Static analysis result for SHA-256 426cb2980665da20…

MALICIOUS

PDF

80.0 KB Created: 2021-02-15 16:41:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0567aaba01666f6e72a177941c46319f SHA-1: 34fe3e85a077e0c8620c585bcbf285ee65e646b6 SHA-256: 426cb2980665da20dce80ea975d657e374c0255daf3e48e7fd98843e515e2a3c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=scientology%20a%20history%20of%20man%20pdf PDF link annotation
    • http://keruvimuvom.22web.org/adobe_reader_old_free.pdfIn PDF document text
    • http://virutezofulodud.iblogger.org/fozukelitow.pdfIn PDF document text
    • http://zotokes.iblogger.org/picture_search_app_android.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/jeNvieq/stachys_byzantina_primrose_heron.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/fhehghh/xifagepotovilubewitapuwej.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/silubebebefuju/bunil.pdfIn PDF document text
    • http://xawazixe.epizy.com/widovebinubominalo.pdfIn PDF document text
    • http://debarunuzijabe.rf.gd/10440489496.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/autoformation_en_ligne.pdfIn PDF document text
    • http://lenamopotinapar.epizy.com/dutch_angel_dragon_ref_sheet_blank.pdfIn PDF document text
    • http://gadiwovujema.epizy.com/android_9_pc_windows_10.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/film_review_template_worksheet.pdfIn PDF document text
    • http://xunepesefosog.rf.gd/jours_de_la_semaine_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/archero_hile_apk_indir.pdfIn PDF document text
    • http://dimafox.epizy.com/bleacher_report_liverpool_barcelona.pdfIn PDF document text
    • http://todizegi.epizy.com/beginning_joeboy_lyrics.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/66285148426.pdfIn PDF document text
    • http://gupexofuvesok.epizy.com/mild_lucid_dreaming_guide.pdfIn PDF document text
    • http://dulaxidej.epizy.com/advanced_systemcare_11._4_free.pdfIn PDF document text
    • http://voxotili.epizy.com/41617012815.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_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 5776 bytes
SHA-256: 4a42e93be11b5694c38c7557ea2ca58c357c22f15ee078d14d1a41ca841e7a0d
font_01_sfnt_off00010e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7D 10648 bytes
SHA-256: e78319857b48bb0a4a414e91c5c7959a6f3849661c0cea3df2632451a7f9b1af

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