Malicious PDF — malware analysis report

Static analysis result for SHA-256 6278d2712565bfaa…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 19:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e16a3174e9fd30f61975deec756828dc SHA-1: 450cbb84feddd682f1a833da39548affef2f4461 SHA-256: 6278d2712565bfaae908fae52eea439c4c95437d227400c8dfbb8e814c337a23
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users through multiple, potentially disposable, domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=gotcha+evolve+hack PDF link annotation
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/wanovafadoxeleketusowokak.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/28966005000.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/dijonez.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/bisolugidepajekuge.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/50120120846.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/sapatuja.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/guwenilefuwalejekudarewom.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/99222905016.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe81641805---zisulerominuvarokanade.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/xivexepivimow.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/33584578113.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/vusozatodumekinaben.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/24563781128.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e737c1209---jexudumikikuzepupezaguni.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/65867854868.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/milozaseluz.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/xigetonitulavugiv.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/45625045598.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/joropawefex.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/33140267335.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/48606705439.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/xosoxeguminizidinonana.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD57 15816 bytes
SHA-256: d453b5abfad37ff261220d1c6c36f068c5424482826a552d327f3fa526ce5a44
font_01_sfnt_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 10060 bytes
SHA-256: 609b504bc6e2e49f9303d826adba95becd52281fb617dfc1209e31c91ad1efc4
font_02_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1