Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aedbab187f160f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 23:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 713b440946647e45ded9a5bc8335b337 SHA-1: 358134847408e23986846e4a214a5b058c97ffc9 SHA-256: a2aedbab187f160f52e354bbf329fdbdd04f637c70226aa8841e1feb93e438f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate the PDF acts as a link farm, embedding numerous URLs designed to redirect users to external resources, likely for downloading further payloads or phishing. No scripts were extracted from this sample, and the document body was unreadable, so the rationale is based on the PDF structure and embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://balletpanov.com/uploads/files/nuxupafigekirinazanosove.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/pilatuxivomerubefozup.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/41973915125.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/milotuzutefewesorunuporaf.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/70860194707.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/ligonija.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/fadolasuxolizofibu.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/28028962050.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/sogumuwijasitixo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/90070957899.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/tozifesuzigejotujuganina.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/dcf84cefa5469f40649a30d336226991/sovaxobowifinesun.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377beb1a6b9---89469695884.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/lovilufenagapasodav.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gotulikifinowiripiti.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/54031582320.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/94824136256.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/sedunaliwujosinovumowebe.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/veradibodiwufufonapi.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/deforinetido.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/rokodasidaxolexisewudu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/29451133986.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/44309519726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=video+maker+free+download+for+pc+windows+10PDF link annotation
    • 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_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 11004 bytes
SHA-256: 680819e84bf202aaf9542e3404fad5c59fd3b6045092b2acd9caafbbdf738949
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 18220 bytes
SHA-256: ec38496bae357948da97b3a8d34daee399d9ed252afa24d8f8ea63bb58af91c7
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1