Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96268084e127166…

MALICIOUS

PDF

70.8 KB Created: 2021-02-21 20:10:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 258eb446591c7c872b14af33bd643f26 SHA-1: d6e44b42ef6c77ac8953165ad67777d40b113649 SHA-256: a96268084e127166108cddc8fa489930622c55a70a9beef381c2b188475d0508
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF's structure point towards an attempt to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=prince+ali+rescue+osrs PDF link annotation
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/misolofedefemiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/jijChg1/visetejubepizevakegepeb.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/toxezikaba-fefiwete-xegamixi-posowaw.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/2b6b6d.pdfIn PDF document text
    • http://vefejukexasiku.iblogger.org/talegapasovi.pdfIn PDF document text
    • http://fuxokubatasiju.22web.org/nhs_pension_early_retirement_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/niporatibu/if1N4jd/game_center_on_iphone_10.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/fopetikeku-faxedikuze-xikorewuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zititerawori.epizy.com/banorte_movil_app_android.pdfIn PDF document text
    • http://zowonoz.rf.gd/dashboard_bootstrap_html_template.pdfIn PDF document text
    • http://tanozetodane.rf.gd/en_nombre_de_la_rosa_completo.pdfIn PDF document text
    • http://wawefib.rf.gd/92866254816.pdfIn PDF document text
    • http://dedamedasobime.epizy.com/caruso_song_sheet_music.pdfIn PDF document text
    • http://vewomani.rf.gd/wolverine_boots_sizing_guide.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_off0000dbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF2 4792 bytes
SHA-256: bfdf46ee6e31f70be0c4bba3ff36e61a549925a32015aeff2ebc38bee6f586fd
font_01_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 10000 bytes
SHA-256: b026e7bb0d678bcd543ca58288aa118a99f6b8a7d43d33fb918f5f2c1ac10138

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