Malicious PDF — malware analysis report

Static analysis result for SHA-256 4977d76d392d6c34…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 05:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3616e725aeaf85eb2248568509b6c233 SHA-1: 00b12587cc04802f018d0a4ae071f20f0a9fa489 SHA-256: 4977d76d392d6c34535698cb1d774eaf02a40c6c496170be30510a52ed480883
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=newest+android+operating+system PDF link annotation
    • https://clubberia.com/js/ckfinder/userfiles/files/maburubusasinerivibi.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/dobifasotuwejisisivopusuj.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/rawiwinejimugi.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/56448556848.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/duwuzavowagafifod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1942b681---23393493781.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/8354849440.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/pafivukosesodajolijoleg.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/tejibak.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138fe2a298fd---mexalofugositulazapav.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/vikofevedujo.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/32559543099.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/dojifexaxovivokeno.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/71057446928.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/39506996273.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/90240127021.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/jaximamobunon.pdfIn PDF document text
    • https://afayl.com/userfiles/file/kifalib.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/waboxetifepupapebov.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210902_CFE3FF18219A778D.pdfIn PDF document text
    • http://inistor.com/ufiles/files/serizejoravur.pdfIn PDF document text
    • http://forti.in/userfiles/file/33932346911.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/64972919914.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_off0000de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE16 17908 bytes
SHA-256: b15a2f99d8f2037fdfc6b458e74113fb4d6fb24feb7d96903235048fb0fd1eff
font_01_sfnt_off00010c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C04 10864 bytes
SHA-256: 5571ca1b642be453cc64fbd0857d1569fa4aaad0ae08c4ff3a26cce0c7039683
font_02_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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