Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf748a1b65fc084c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 14:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff13ee9d20fdf24c498394af95c80ea2 SHA-1: 1f1e1fd6a9384dad5b0ae6992f7f17765691e646 SHA-256: bf748a1b65fc084c4501a8fadfc6f5f12577796a71184b23e135435f978faa85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URLs, suggesting it functions as a lure to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support its role in directing traffic to a network of disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://coretry.ru/uplcv?utm_term=finding+the+sum+of+a+power+series PDF link annotation
    • http://jevades.com/aircraft/fckimages/file/73540048129.pdfIn PDF document text
    • https://33mobility.net/uploads/files/77614404978.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/raxemiko.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/45146734993.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/78695279918.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/69986139445.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210904_268EAED6B7DE24F4.pdfIn PDF document text
    • http://nktrading.qa/file/files/93722370793.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/88277326857.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/batizubarujozinizud.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/88166670198.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/28914267142.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210917043031183.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/24578866883.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/dotobomijor.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161408f05c4f23---kusojajeripojizugo.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/megujexudatavoziwe.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/25550618730.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/7894422481.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/gunuruzomipadapadosun.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/fugadarupuxepinalimegabe.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/7940119164.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/48668985182.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/64175197076.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_off0000aef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF4 11060 bytes
SHA-256: 5bebf2fe03ce0ddbba34f238c129a961c0634814a33f139dcf3c76b7047cd283
font_01_sfnt_off0000c850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC850 16276 bytes
SHA-256: 902e239c74ec43b7079ad15110482b823de4b0c91745bf3a29c47b582d639e8a
font_02_sfnt_off0000f1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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