Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e23fc96439d31a8…

MALICIOUS

PDF

67.9 KB Created: 2021-02-20 00:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: af9de843c7b41ec05ea2499380d41974 SHA-1: 94ff9f911684aa92a4ec1ffb3192ab2a648886ca SHA-256: 6e23fc96439d31a86f7f418633701a76f6f5c46529ff3e4ac086b472bfe788d2
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The presence of 'SE_LOLBIN_RUN_COMMAND' and ClamAV detection further confirms this PDF is malicious, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://maypoin.ru/123?utm_term=how+to+write+objectives+for+a+grant+proposal PDF link annotation
    • https://tositoda.weebly.com/uploads/1/3/5/3/135312816/5380843.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/zgg74jf/pixuv.pdfIn PDF document text
    • https://rabidibizuzej.weebly.com/uploads/1/3/4/6/134648686/xusavisos.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/e1ihZPZ/xexitubuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_5fe7696b8a123.pdfIn PDF document text
    • https://pipefedib.weebly.com/uploads/1/3/1/3/131383483/xupijodisoka.pdfIn PDF document text
    • http://gasufulezexe.22web.org/format_curly_braces_python.pdfIn PDF document text
    • https://kuserivexujeza.weebly.com/uploads/1/3/4/3/134331384/tazogolopa.pdfIn macro / runtime command snippet
    • http://vowazokisexe.22web.org/zumiviwediwu.pdfIn macro / runtime command snippet
    • http://fitness-ital.fun/human_anatomy_for_artists_gyorgy_feherhwdz9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417815/normal_600626059a4d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fe5e17920813.pdfIn PDF document text
    • https://cdn.sqhk.co/vujuzira/hbihiuJ/47645453677.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5fc6746ad4f89.pdfIn PDF document text
    • https://cdn.sqhk.co/pabonoruje/arIlgjq/carmageddon_reincarnation_ps4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaritopewebo.rf.gd/tarivuvaduw.pdfIn PDF document text
    • http://putiremupupunis.epizy.com/modern_linux_administration.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://zaritopewebo.rf.gd/tarivuvaduIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 5512 bytes
SHA-256: 9adda15c16029f64e287696fab824a8e1850d3677e7b9bd1ddd282116f86f8b3
font_01_sfnt_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 10060 bytes
SHA-256: 90894f92b87833c54e4099e8b48c1a1715e6850f2894d94659cce7a91a748a4e

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