Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e166b43a5f8f82…

MALICIOUS

PDF

76.4 KB Created: 2021-06-04 05:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0f0770914e1c052d1dc9503fdf6063f3 SHA-1: 4b3951ccfe3505548c3f767cc7984a83828100fb SHA-256: 82e166b43a5f8f824dba17bf1e85f0aa1115d3a8a63881852b810ae406c6e664
284 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting, indicating a link farm or SEO manipulation attempt. The presence of 'powershell_scripting_language.pdf' in the document text, along with a critical ClamAV detection for 'Pdf.Phishing.Trojan', strongly suggests malicious intent. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/123?utm_term=citrix+workspace+mac In PDF document text
    • https://fozafilamo.weebly.com/uploads/1/3/4/3/134314768/a06b2576a73673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_606544b38d789.pdfIn PDF document text
    • https://doxazijizule.weebly.com/uploads/1/3/4/6/134640144/5d19c2938da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_604b351f9785d.pdfIn PDF document text
    • https://fozafilamo.weeblyIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/391621bc-d46c-4455-b6c1-c880966efa8e/gerunuvapurixejup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e59cba7-9a85-4fd9-8abc-cd20746742f6/windows_powershell_scripting_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11b6489-e798-43e2-8550-8602a37a0bde/cisco_chapter_6_practice_skills_assessment_answers.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418503/nixak.pdfIn PDF document text
    • http://fogofalo.pbworks.com/w/file/fetch/144548205/37895757281.pdfIn PDF document text
    • http://subazim.pbworks.com/f/jigabutemosomejozipoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4b0b79c-9f5f-47a5-b89b-e627455a3ab9/dunkin_donuts_chocolate_munchkins_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d883de0f-1d58-43bb-9783-a843303407e1/amar_o_depender_de_walter_riso_libro_completo.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144427107/android_oyun_club_clash_of_clans_hile_apk_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c60f18-ab4e-445d-898a-78c7597d8cea/1965_ford_mustang_for_sale_san_antonio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042e3a9a-8ac0-42ee-9918-f489b01cea28/do_all_routers_support_5ghz.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144529608/57106663204.pdfIn PDF document text
    • http://saladolu.pbworks.com/f/best_print_ad_campaigns_of_all_time.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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 5176 bytes
SHA-256: b1e65a8bcf87d75d53e44369d357d22d5528b1d52f39c827c6ec3098a2e5921e
font_01_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 10888 bytes
SHA-256: 574a4d5214b45553d834f2bb174c5a1d21f8b84694691606e2148ead66ef84a4

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