Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd790a76ca00926a…

MALICIOUS

PDF

76.2 KB Created: 2021-04-18 00:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4b2f0d08e58a556a5363abd996abcf3a SHA-1: 841fb45269c68053c16f0128ea32ed465bad7613 SHA-256: dd790a76ca00926ae3013cd4913ba79f4d599fa862de886ea451f99f5e5d0d61
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 0.9998

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
  • 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://lozipotod.ru/strik?utm_term=how+to+open+weight+watchers+scale PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476285/normal_60187c580488c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464534/normal_604b29cb49c0b.pdfIn PDF document text
    • http://pinipuvazus.22web.org/descargar_akinator_apk_full.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_606508cb45be2.pdfIn PDF document text
    • http://modebedunizux.iblogger.org/petenawelonuxojowovebape.pdfIn PDF document text
    • http://neriwozu.22web.org/windows_10_powershell_download_file.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5fe631f56ced8.pdfIn PDF document text
    • http://gurotazejo.22web.org/barron_s_essential_words_for_the_ielts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gisipusizen.rf.gd/capacitor_colour_codes.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/mupozuvalazanuroseb.pdfIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_d3a83c22f7ec4c60aa5ee314e0a1e197.pdf?index=trueIn PDF document text
    • http://xamukipadu.myartsonline.com/85762890478.pdfIn PDF document text
    • http://muwosogada.rf.gd/instrumen_survei_standar_nasional_akreditasi_rumah_sakit.pdfIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_cc307d36768d4a7887f69008bbefdc27.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_ed42ad12be9d4dc2a576480568694a20.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_fd2d1b2d1e7f46d7ab5a2c43fd348f2c.pdf?index=trueIn PDF document text
    • http://wufejupixixot.epizy.com/9380299843.pdfIn PDF document text
    • http://weguxoxuwaxa.epizy.com/ielts_sample_writing_answer_sheet.pdfIn PDF document text
    • https://a29d81ee-e589-4368-99bd-4e0be04eb4c0.filesusr.com/ugd/a89e6e_b0fb21a0db424d138cb379b14bbecae4.pdf?index=trueIn macro / runtime command snippet
    • 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://weguxoxuwaxa.epizy.com/iIn 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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 5248 bytes
SHA-256: 3cc2437e38bddce309421fe2401eac27d832b9cc66cf8e10c789f9758f950aa4
font_01_sfnt_off00010003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10003 10500 bytes
SHA-256: b60477e538526c34a872cd3346caec9aa8f6cdb431c66173adc686280aea7102

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