Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26053047e954285…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 21:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ebbaaf2d63bc6dae305acf2291d7ad8 SHA-1: 357c5d244039e01d7bcf8ebdbd5a06a0172ad1d9 SHA-256: f26053047e954285c31a215282a44f57d1312a918403dd70f1b31597692e2ca4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on disposable hosting, suggests this document is designed to lure users into downloading further malicious content or engaging in phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this is part of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=you+can+do+it+waterboy PDF link annotation
    • http://lechioutdoor.com/userfiles/file/vopipegenivozumuwewag.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9551edc3---mazudobew.pdfIn PDF document text
    • http://na3.it/misc/file/vukopelura.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/73994616753.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/bojobig.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/8f2c453b02918c5245ce0b330b6fa9dc.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/wisogilejujot.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613799701c1fa---82154026589.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/nipabuwiraguluvogo.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/mugolixorojarive.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/59052284023.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/mopeliroru.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/bugubixamelokuvobukugop.pdfIn PDF document text
    • http://ge-mak.com/files/visesatop.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tetonazituxatun.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/77155536662.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/mamav.pdfIn PDF document text
    • https://edarky.net/data/file/mavojodotuxoreviriraxu.pdfIn PDF document text
    • http://preiss.at/upload_files/files/lerufaz.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/56717265365.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/tinarinanub.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/60962136126.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/53654080239.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_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 17680 bytes
SHA-256: 1b42d84da510026ef37fcdee60aba5024212b4a9134fe203df617c7d965e619d
font_01_sfnt_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 10572 bytes
SHA-256: 9758b6e53550895bc66fe99a685c06643f97c68c0202a3a36f489d239105851d

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