Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c6af9acb1a143c7…

MALICIOUS

PDF

76.3 KB Created: 2021-03-31 11:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5794a15c7b4b316ee7508a31af3de3a6 SHA-1: 113559d893da8e1a7a395300c581f40ae244e252 SHA-256: 2c6af9acb1a143c7eb1f940d614b97b93581f887586750dfc2f73955e42e47ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=multiplication+decimal+worksheets+grade+7 PDF link annotation
    • http://sdfsdfsdf.shaketorch.com/address_format_for_job_application_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/wusakituzu/wgc3gcB/bowling_score_sheet_sample.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5ffac2884f9c9.pdfIn PDF document text
    • http://gugatem.22web.org/b_c_caste_full_form_in_tamil.pdfIn PDF document text
    • http://popuririrow.iblogger.org/automatic_door_opening_and_closing_system_using_arduino.pdfIn PDF document text
    • http://puveputado.sportsontheweb.net/vapaliserokeze.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/RjajcDL/playstation_app_store_games.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/bidjdgi/medieval_castle_conqueror_s_blade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379970/normal_5fdf3b9c1e80d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_600bf988a11c0.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/gqbxATa/kobewitin.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/cracker_barrel_menu_breakfast.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9658a0e-fa20-40d2-97f5-163356e88349/hp_z220_motherboard_price_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07cec7b-2e98-4b3d-9a9a-0242121e2f91/zasurej.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_a4d8f345261b48a38d6c1e76d244dd87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed02375-71e4-4609-b775-bcb0a7cf5b44/4825335299.pdfIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_990cca11d10a43af88a27dc99361ae34.pdf?index=trueIn PDF document text
    • http://visunes.myartsonline.com/3m_600_tape.pdfIn PDF document text
    • http://mufomasugom.epizy.com/78304863996.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a0962e2-0e02-4f46-b020-007e4724daae/fufedutixetigurig.pdfIn PDF document text
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_dcaf744c38644055944fb92a376a5b03.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_5cfcc2c2b73c481e8da495eb3f975cb8.pdf?index=trueIn PDF document text
    • http://jubogaju.atwebpages.com/gobuxoravaladarubal.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_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 5728 bytes
SHA-256: e5c9139f1ed676e30a9257dfe46016db1654547005766c815139181b6edea44d
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10804 bytes
SHA-256: f6d5c69841c0ed4b1feff78fc4547896f3e4e71b11a91d8e4b02e464bd09ea21