Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eff5b8c4a1e7a36…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 08:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02fa29c6859d5f7a6ea43671e786442e SHA-1: 467a6d38c3d1ae42936aafe62af4548f54bd8894 SHA-256: 3eff5b8c4a1e7a36c1567bcca11948ce94015a3297f9179a230b4daff5a47205
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous unknown URLs suggest it functions as a link farm, likely directing users to phishing sites or malware. Although no scripts were extracted, the overall structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://valencia.thepokeluau.com/uploads/files/zirof.pdf In PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xasavije.pdfIn PDF document text
    • http://jarosi.hu/files/file/60196796322.pdfIn PDF document text
    • https://retta-bg.com/userfiles/75151981014.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/juzupo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144ca9a4d334---wikepiguwubi.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/fovekiresakosaselutodi.pdfIn PDF document text
    • http://hopkim.vn/upload/files/dovaputokavi.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/vijidaveki.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210908055417.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/36699088713.pdfIn PDF document text
    • https://magerp.org/upload/files/49296741620.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/ledazonitilufuxijet.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/75605483601.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/giwotuxodekewedelib.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/74384020329.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/52033384165.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/mazekawuzeroze.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/jojabopigamuvureditad.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/80033547500.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/varurujezowovarunokesapix.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/20613026249.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/64795867439.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+5+skip+human+verificationPDF 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_off0000b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 17772 bytes
SHA-256: b30a3fe7e07888f3513c382dbd975b206fbe056a58d791a8e13f52b5ddfef94c
font_01_sfnt_off0000e262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 11132 bytes
SHA-256: 0bd3e3752a07b43339611a4b6b21cce4ac7d7d4c64f26fee7ac219e9d5f89078

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