Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5fc52db8d64e45…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 12:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0daf69c325e3da6228282f87de78bb3e SHA-1: dbe252708406de65a307a5e56f728b838fac0ac7 SHA-256: 2e5fc52db8d64e45fd21cd62db70a4a261653e84dab64647e7c14cda7a17560f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The presence of external URIs and a link farm heuristic strongly indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=robbery+bob+game+mod+apk PDF link annotation
    • http://barudan.hk/UploadFile/file/20210914165708269.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/jubipugazarikelexogikak.pdfIn PDF document text
    • https://buyafranchise.org/files/files/jatebad.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/26891401617.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/jujosipobi.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/48222919071.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/tezozise.pdfIn PDF document text
    • http://parilka.by/var/upload/file/mijitutusekodolenarar.pdfIn PDF document text
    • http://alptw.com/images/files/gevivanugikono.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/60147903751.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e04e86b---71818661558.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/14548039475.pdfIn PDF document text
    • http://ping-property.com/user_img/files/vigaribowofi.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/78228174659.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/98768931956.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bituwofomejulej.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/wojojikifojoviba.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/31846002273.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/10521846357.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/fojuxin.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/31542766022.pdfIn PDF document text
    • http://ledins.lv/cms/file/vatekakobozuxak.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140d2914cd3a---nomugefuzegatafukonebi.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_off0000da87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 17624 bytes
SHA-256: 1fb9f0fe337aa27f366a0f8191b12312e48c7061964b9e92ecaed29d8df4a6a2
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 10620 bytes
SHA-256: 7153658c8a9b4ad4c8b3d94ea4876b31137b72ef93bdeaa558faff46509bec5f

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