Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4548e1fe5fe2e43…

MALICIOUS

PDF

70.3 KB Created: 2021-05-05 20:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 739904e8e661f796d301a4f0bced9e89 SHA-1: e5dc4299edc41f362377a6690529e426a58b2af9 SHA-256: d4548e1fe5fe2e434f554cf9bc1aa5f21b3b902bd152852de51765e057c733b7
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://vilenefex.ru/strik?utm_term=c%2523+interview+questions+for+2-3+years+experience PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6035765f16c6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374002/normal_5ff942f3d5458.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407302/normal_600251c7e51c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485935/normal_5ff3a05813cf6.pdfIn PDF document text
    • http://servicesforsupport.com/62689517334fe25m.pdfIn PDF document text
    • http://vanlit.ru/56315069602i6w38.pdfIn PDF document text
    • http://leaninrzpd.site/punesozegiperixuvotibop16w4z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_5fd62ae2c071e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_60681f41b648a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413011/normal_5fc71aa82f1b5.pdfIn PDF document text
    • http://eeuuurrrrr.space/37572379292aiimj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5feb0bfe9343b.pdfIn PDF document text
    • http://badoxik.scienceontheweb.net/canny_edge_detection_matlab_code.pdfIn PDF document text
    • http://changepass.online/cnet_speed_test6xp8t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_60583cfaa7925.pdfIn PDF document text
    • http://eurostore.info/jeep_bunk_bed_plans_twin_over_twinq1wi1.pdfIn PDF document text
    • http://static-start.top/how_to_do_a_finger_wave_curl3n946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_606935fea71a9.pdfIn PDF document text
    • http://xerujupuje.sportsontheweb.net/6987669377.pdfIn macro / runtime command snippet
    • http://buylettersonline.com/how_to_pair_verizon_fios_remote_with_tvlazf8.pdfIn macro / runtime command snippet
    • http://lovelid.xyz/262048146708yf57.pdfIn PDF document text
    • http://osthondroz.com/90061096037l8zlj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/nIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijuvunote.onlinewebshop.net/90574487695.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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 4064 bytes
SHA-256: 81614c9197605b24bf552181ccd4611c3d67a32cb6786828e1b96da89ae1f7c6
font_01_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 10296 bytes
SHA-256: 5706bd7446ee5b4c54682c8295cdb850dc440f550cb2353ab1bec4f84f4d4d77

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