Malicious PDF — malware analysis report

Static analysis result for SHA-256 d29795c6d0140e23…

MALICIOUS

PDF

129.6 KB Created: 2021-06-02 12:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 83dd4dc094672439b906ad61c7f8b07c SHA-1: b244de6df6735326de368a8d13b03c26fa354dbb SHA-256: d29795c6d0140e23f307c9b2f7a257e053a64a5653074226f59253f107ea363a
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install 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 0.9978

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://botokaw.ru/123?utm_term=mainstays+flannel+sheet+set+queen PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380539/normal_602f8a3c24f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495531/normal_5fe99f834c0e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_605ae29dd19ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404723/normal_602f1457afc93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_604604c8c0802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_60417ecfc1272.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fd61fa8787ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://degenazi.pbworks.com/f/87076460653.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144423600/moxanapapukiseporewekere.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/data_analysis_and_decision_making_with_microsoft_excel_revised.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144427935/what_does_the_law_of_absolute_cost_advantage_state.pdfIn PDF document text
    • http://kejuziz.pbworks.com/f/fixegozibug.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/w/file/fetch/144488379/are_apple_cider_vinegar_gummies_keto_friendly.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/f/how_do_i_cook_a_small_sirloin_tip_roast.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144501654/woxamaxevubasikararasof.pdfIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144442158/how_to_check_the_license_plate_number.pdfIn PDF document text
    • http://ziriwuru.pbworks.com/f/mrcrayfishs_furniture_mod_crafting.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/latest_tamil_songs_collection_zip_file_download.pdfIn PDF document text
    • http://mavujeridolu.pbworks.com/f/domestic_violence_shelter_brooklyn.pdfIn PDF document text
    • http://lomubel.pbworks.com/f/star_wars_the_last_jedi_incredible_cross-sections.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/98395853220.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144493515/absolute_beginners_guide_to_tarot.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144428280/els-yds_dergileri_indir.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/33215753141.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/lord_of_heroes_contract.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 54164 bytes
SHA-256: 2ec2523dccea5bea35dca69fe78beb30852c741aa45d42929a98ec48c757e06e
font_01_sfnt_off0001a6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6BE 4992 bytes
SHA-256: 6dcceff6081d593757b2995a0030fff412ac2a4b2a6088ae213051998d8c6231
font_02_sfnt_off0001b7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7CF 11832 bytes
SHA-256: 760553cecd0c7108db9ba8d70690eac4b5bdd0a4b72156f87112599cdf5f7977
font_03_sfnt_off0001df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF6D 16160 bytes
SHA-256: 7e63eb3bed9c4ceaf47e86587cf77a789dba98dd2b4db382f0c7f052a0aeb8ce