Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26ae49477b5c7a8…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 01:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d308e815d5c84f2a77ff73cbe12ebca SHA-1: 036f8052db97bb93ccc880f61cf541978f6665ac SHA-256: f26ae49477b5c7a880ed86049dfcaefdb85aaeb7daa4e52c9a7442e6b274a492
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the presence of numerous embedded URLs, many hosted on disposable domains, suggests a downloader or redirector pattern, potentially leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://xn--h1agcmh.com/ckfinder/userfiles/files/91451800103.pdf In PDF document text
    • https://takarasushimn.com/userfiles/files/95980431703.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/biwase.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc796b6a99---45414057118.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/92086049631.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/66326377682.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/92629662368.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/86567925905.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/7067292185.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-10/20210910184500177207.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/susetowe.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/71369480077.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/97369653677.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/tipixanikakuvamupuwefi.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341d57a225d---88868226152.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/16025444026.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/monikivifusikutizol.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/28640856359.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/77854622909.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/viduruzigozifavegoriwanog.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/bexulesuvelivijudol.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/pomokunogib.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/69737220701.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/dofigutubogulomupigazotux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=password+protect+safe+mode+androidPDF 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_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 17416 bytes
SHA-256: 980bde77fc053aa73209dff2971f7058f706effdbc78bfb74716fff8bd6128ad
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 10820 bytes
SHA-256: f86ad7bfd400f4e4976241f9332d4541988372b543b54a8c254b1e21cf1dd1e8