Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf52b77d75bcb26…

MALICIOUS

PDF

96.3 KB Created: 2021-01-23 16:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 81af0a39bb074b20c7224490be87947f SHA-1: e7789decf51e08349eb669d33cad0bf0642a4e29 SHA-256: 1bf52b77d75bcb26f4ebb97d6ee5e397c7580a2009801dc5ab8c4ed55ce23918
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious. It contains multiple external URLs, some hosted on disposable domains, and exhibits characteristics of a link farm. Notably, it includes a 'Clipboard command execution lure' heuristic, instructing the user to copy and paste content into a shell, which is a common technique for executing malicious payloads. The presence of these indicators strongly suggests an attempt to trick the user into running arbitrary commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://baarspo.ru/aws?utm_term=launch+avd+manager+without+android+studio PDF link annotation
    • https://cdn.sqhk.co/zowolanazew/OJUjehd/tufusi.pdfIn PDF document text
    • https://cdn.sqhk.co/derixosu/iap9NWn/pifokadek.pdfIn PDF document text
    • http://ramosek.iblogger.org/tarjeton_anticorrupcion_colombia_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420451/normal_5fe8d8ae8517b.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/wggjhhf/jitizaruliduxazofebomep.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/hbhagdp/war_dragons_2016_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_600b5336c910a.pdfIn PDF document text
    • https://cdn.sqhk.co/mexovaru/tAQgfLt/into_the_dead.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/0Iqjfih/we_sing_karaoke_app_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_600861b3345b0.pdfIn PDF document text
    • https://cdn.sqhk.co/gebemiwisero/gfidids/90178130010.pdfIn PDF document text
    • https://cdn.sqhk.co/lejukujegomi/gdxxUgd/fakiwugituvonupexefi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poziluxolebulu.epizy.com/ashoka_chakravarthy_video_songs.pdfIn PDF document text
    • http://jegowijuvu.epizy.com/dedobojawabaduse.pdfIn PDF document text
    • http://budunasetixap.epizy.com/81302255901.pdfIn PDF document text
    • http://povuputuk.epizy.com/93624607991.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_off0001385b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 5416 bytes
SHA-256: faba84ca2931b7718ce99be7cf5e54fff7acd3d6ab892f22d3a4a114d61c848e
font_01_sfnt_off00014ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB0 12132 bytes
SHA-256: e226f4d54b789eaefcfc933f00d5919b5bf1331a50eccbcfbfc3da7d16b32a67

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