Malicious PDF — malware analysis report

Static analysis result for SHA-256 441e34275ca1b506…

MALICIOUS

PDF

83.9 KB Created: 2021-09-19 08:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21c3807130bd39e31c8e78ca63302146 SHA-1: 45172ac21400553ffc869782249324c9f5a1c74a SHA-256: 441e34275ca1b506b1843fb3465e696e39efa455a881d1ffbb3584b9a4164a14
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and heuristics indicate it functions as a link farm, likely designed to redirect users to malicious content. The presence of a 'password-protected archive lure' heuristic strongly suggests the document is intended to trick users into downloading an encrypted payload, which is a common tactic for malware delivery. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ruresept.ru/files/file/rukat.pdf In PDF document text
    • https://hbfilm.ca/resimler/files/81760601779.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/matalikumukedumilob.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/35197931997.pdfIn PDF document text
    • http://artio.pl/files/files/60255523370.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/520b5bd02d05a68c216e6cbba35fb184/towarevabovisuxuguzen.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/42045863653.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/japux.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/1444870626.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/boxawevelemelozalaxew.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/9184839430.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613106dcddac3---gexomekimikasipasefuv.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wefizak.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/14279063360.pdfIn PDF document text
    • https://nada70.org/userfiles/file/lipibosogad.pdfIn PDF document text
    • http://nadafashionbelt.com/Uploads/file/sijaxidom.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/jiledizovexojate.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/basigujoxudaniver.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/41654614803.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/1379990369.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/8237035872.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630859041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+3+cleo+by+royal+gamer+zipPDF 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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 10972 bytes
SHA-256: 26fa5617297b16a581f0401d9e15549c644334e4c6f6d838640eca87db1b78cd
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 18140 bytes
SHA-256: 84b0f7f3d9ba6d5aa053b90d7d87982448193d91e9ad660a375216b9ec00921e