Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d10a76477d3fe5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 11:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: adac98fa6371f9204287d09a7a347368 SHA-1: 3937fa2597f59d8ec359168b9106b8417fd4cb43 SHA-256: 92d10a76477d3fe583365e251470234fdfcb24f2bf51d61c70713c0fb5e45266
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The presence of a 'download button' lure and instructions for a password-protected archive suggest an attempt to trick the user into downloading a secondary payload. The document also functions as a link farm, directing users to various unknown PDF files hosted on potentially compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ueros.fr/admin/ckfinder/userfiles/files/fewobenobirifofujekirur.pdf In PDF document text
    • http://rts-3.ru/upload/files/72456326133.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/wogudaku.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/bukimilu.pdfIn PDF document text
    • http://opersan.com/file/44389045094.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/lotij.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/nepawuduzu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/89019667434.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e09839f0f---mabesavupexotuk.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/96698263264.pdfIn PDF document text
    • https://thehouseproduction.net/file/lemobanogidesejibewimo.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/bolameviluwinelewove.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/61253849276.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/51778758690.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/vekonedon.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/50602763022.pdfIn PDF document text
    • http://furniture83.com/upload/files/digulaxoborevojo.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/61908455432.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/32422890825.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/926953304.pdfIn PDF document text
    • http://talleresjpg.es/img/file/61794656192.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/jilinotosolikedi.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/jurumomov.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/kemosisoruja.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/59901262753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+print+protection+remover+onlinePDF 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_off0000ddb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB1 10520 bytes
SHA-256: 05a80188b15049bcf6e1a31d9aa1108810e43fc61014580c25e67e83f409f90d
font_01_sfnt_off0000f595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 18120 bytes
SHA-256: f1a63ffdb830c2d9bef1d314cbbdaa7745686fe67c9ecd9404ebcc1771bfb7fa