Malicious PDF — malware analysis report

Static analysis result for SHA-256 b838a0b5063d26fc…

MALICIOUS

PDF

74.3 KB Created: 2021-02-18 23:01:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bc6321ddc141d9af803cb204c1acc195 SHA-1: 46d6df06529bee60f892cfb739a741e39cf24440 SHA-256: b838a0b5063d26fc63908d198aeee2fff0843bd54a39e2d8287ccf2c4d2217c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is a link farm on disposable hosting. The embedded URL, https://leonvi.ru/strik?utm_term=the+dragon+prince+online+sa+prevodom, suggests a lure related to online content to redirect the user. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic point towards a phishing or malware distribution attempt.

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/strik?utm_term=the+dragon+prince+online+sa+prevodom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457604/normal_5fd9a6978ec42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_5fd6791c3c1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5fd6376f92693.pdfIn PDF document text
    • https://cdn.sqhk.co/jakatote/hahaeWF/3697883166.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369334/normal_60081bec87db4.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/hifXhff/lusunupunebaladadasoz.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/F3gckNm/9977683687.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/oE9hajh/survival_servers_space_engineers.pdfIn PDF document text
    • http://rawuzexo.iblogger.org/biryani_bana_ke_bhojpuri_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450350/normal_5fe07bf688b79.pdfIn PDF document text
    • https://cdn.sqhk.co/tezejikibus/fzoghaa/fomorugubonoduwoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446490/normal_600b1ee1ce5e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fe78f8abccc9.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/giPjdjc/video_player_for_windows_10_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gelunusa.epizy.com/jamejor.pdfIn PDF document text
    • http://mupevisad.epizy.com/20173154749.pdfIn PDF document text
    • http://fopekexu.epizy.com/99039086537.pdfIn PDF document text
    • http://bujoraz.rf.gd/xabezin.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_off0000e2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 5496 bytes
SHA-256: 2674c7c4a05a400806bba6cb28fac52077cfeee96fb65448e6c5bfc34e37b712
font_01_sfnt_off0000f584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 12144 bytes
SHA-256: c007f614fd65bcd945ed8615d8e109cc17dfb29a7b49d613294594b194608232

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