Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e0b8cba2a5212a…

MALICIOUS

PDF

72.9 KB Created: 2021-10-04 20:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5e2a9cb061acc5c45dbd9e4e1a31e613 SHA-1: 6a1da36562e927ade4e807879e06cb314d978bcf SHA-256: d4e0b8cba2a5212aaf86a9da37a01465f29be81c475e1208923598cbede52a8e
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 presence of numerous embedded URLs, many of which are on disposable or low-reputation domains, suggests a phishing or link-farming attack. The document body is heavily obfuscated, but the heuristics point towards a malicious PDF designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://archism.ru/uplcv?utm_term=grace+period+of+expired+driving+license PDF link annotation
    • https://rrrc.us/userfiles/file/wonis.pdfIn PDF document text
    • https://dalba.net/other_files/File/tuladiwovivaru.pdfIn PDF document text
    • https://topupdana.com/contents/files/83851818023.pdfIn PDF document text
    • http://khocabien.com/uploads/files/nitifamopevujevuzu.pdfIn PDF document text
    • http://dolonchem.com/upload/files/tokazuvotonurutonaziwi.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/visoradojunitawisoz.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/30898090801.pdfIn PDF document text
    • http://limoride.net/gallery/file/13577822345.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/fagumex.pdfIn PDF document text
    • https://tigaintan.com/contents/files/pebosisuwabetatudiguju.pdfIn PDF document text
    • http://epplast.com/files/file/6497788744.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/zafujuguworulad.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/bolegekamifu.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/39436874170.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/devidawego.pdfIn PDF document text
    • http://rilta.net/userfiles/files/66089275452.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/gobix.pdfIn PDF document text
    • https://theipbuzz.com/images/file/23716697450.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/11049585256.pdfIn PDF document text
    • http://ivankrivanek.com/userfiles/file/kikejefigojijuw.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/97802790687.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/73569843402.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/47796243313.pdfIn PDF document text
    • 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_off0000b93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 17092 bytes
SHA-256: 2b6c05bc9ca5e8ce0b53f2027b74207decd6f82f26e1f2dcfd155d3a332ef52d
font_02_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 10904 bytes
SHA-256: dd2c5805b574fcda9c00f7ffefb60a89da8a1067a94dc1c442e28cb7e6f629d8

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