Malicious PDF — malware analysis report

Static analysis result for SHA-256 207c1635e5141252…

MALICIOUS

PDF

72.5 KB Created: 2021-03-29 02:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7a52f20da92736c9f8be4d91bd502d43 SHA-1: c0979478148391e1aa13ccb477f61c0cf1fc22f0 SHA-256: 207c1635e514125229b6547836c39bc04f083a8aab1523e33fdbf0f5ec33a259
166 Risk Score

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 0.9996

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://zajinet.ru/award?keyword=livre+cabalistique+pdf PDF link annotation
    • https://fosevagepuvuro.weebly.com/uploads/1/3/1/8/131858592/moboli.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/what_does_it_mean_when_my_dyson_airwrap_flashes_redwuiz1.pdfIn PDF document text
    • http://f13x.xyz/62564501967x96wo.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/mbfoogj/traffic_watch_7_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/llLjbgg/rafoteke.pdfIn PDF document text
    • http://creditpm.com/51895750471p9sb0.pdfIn PDF document text
    • http://mon-cmbretagne.com/short_curly_haired_big_dogspm8wj.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/iibge3C/resident_evil_el_capitulo_final_netflix.pdfIn PDF document text
    • https://muwewixobajigu.weebly.com/uploads/1/3/4/3/134312624/jigibufukaze_madono.pdfIn macro / runtime command snippet
    • http://prizinsta24.online/sbi_online_banking_form_2018820lq.pdfIn PDF document text
    • http://pearhaidhr.fun/autocad_civil_3d_2018_tutorial_free_download9gpbj.pdfIn PDF document text
    • http://crysety.xyz/dedivonopoduxuxil3f8kz.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/9gflchi/edmodo_parent_guide.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/3-5_additional_practice_zeros_of_polynomial_functions_answersh1qzy.pdfIn PDF document text
    • https://nomozusosowewox.weebly.com/uploads/1/3/1/4/131453154/1235219.pdfIn PDF document text
    • http://streichpack.online/juzififipebo0gdjj.pdfIn PDF document text
    • http://openplafond.xyz/lagu_on_my_way_pubg_matikirin6y66.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/nineg.pdfIn PDF document text
    • http://natorg.fun/mathematics_for_economists_questions_and_answersirom0.pdfIn PDF document text
    • https://cdn.sqhk.co/mukutosi/In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_4876fd38364c43e190300d3956a82297.pdf?index=trueIn PDF document text
    • https://d90bda3b-35dd-409f-9d4b-b4a00d881a52.filesusr.com/ugd/b88e3d_7d7cb1a5c6f74072968e43f8d46c0124.pdf?index=trueIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_3ae9336d4a774470a18ea5ca59417c67.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE78 5084 bytes
SHA-256: dedb36b4bc72a80848a02b1a812fd11fbd1ae01c84bf0db3f13e6a855945dc68
font_01_sfnt_off0000dfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCD 11532 bytes
SHA-256: 23726837d8a864c411fcc0960892863d061f0ef227762ce8d011244933f359bf
font_02_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176