Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb110e33d343a02d…

MALICIOUS

PDF

68.7 KB Created: 2021-10-02 09:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 283d15cb6c318b58c4eb60d5f81af369 SHA-1: 54b40361745c9f763a8b30e2723986d0f3f892b1 SHA-256: fb110e33d343a02db47af35d783b6e08d24dc4a66c8e96d578eec2fc1c24abe2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is the primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://stihoplet.by/upload/editor/files/vakupezutolizive.pdf In PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/64452370903.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/60835683843.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/45061473906.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/67733640788.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/47394560667.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f5a1b87fbed60dee7394ecfddd4e1889/21681083777.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/dovatujumapaxenogegeg.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/vizipenigawunene.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/56734796705.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/36038499863.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/darelovekerivakesu.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/51924813140.pdfIn PDF document text
    • http://cuiquji.net/d/files/lowuzabifozekudetel.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/68733226121.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/morofagurajusiw.pdfIn PDF document text
    • http://220-wm01.netdbhosting.com/file/kuloruribur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b419cbc712---muzopafobisusefete.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/46934275657.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/rifanoxefenulon.pdfIn PDF document text
    • https://luminex.pl/upload/file/petudubasesopazip.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/25455940673.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/85579547164.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/64341547131.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/5031211724.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/14662925206.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/64787989923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+respond+to+why+should+i+hire+youPDF 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_off0000b158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 14280 bytes
SHA-256: 49d059cfdb5557fec042911b19cf23ed7239bc174bdf803e8429ef64b16faff8
font_02_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 10616 bytes
SHA-256: ac0a7a4de7a5c39bcd73a9d034f2f2207f88ef5f324bac0f990ea53e572bb427