Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51fd3347d6bed35…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 12:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c7ca733d8785cbfd36ada343aaa93cd SHA-1: af8f792adc4c99f2a146a783db09eff8beb6098e SHA-256: b51fd3347d6bed35690f5e6c9374b355cedb627cfb48a94686050b8fe2395f50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://tokstar.com/_UploadFile/Images/file/walefevepazafepekepo.pdf In PDF document text
    • http://villalapinetafavignana.it/userfiles/files/banogeda.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/2253475304.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/tukawuturasopamaxon.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/pujuletoziz.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_08_26_31_4847.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8e07ff53---sufugodunu.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/35662424669.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/7278420617.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/texiba.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/5a92bcb44b95ce7b6650267afa24b3ad/90575785118.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/65718022075.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/zepaborelivag.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/bidoxikif.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/72668591280.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/gejipaxatateto.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/womaravudadewatogemi.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/jakoxa.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109122104186043.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/betaduf.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tukudelutawibozuvumo.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/pokerim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=365+days+book+2+pdf+free+downloadPDF 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_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 18448 bytes
SHA-256: 771a95af1922b6e927e3c5a27aabbdbcac508f0dd910a167cda4140a91ed9371
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 11232 bytes
SHA-256: 3909d9e6dfc277004723fe61b6a8647b59bf1d8fb5cd1d7e5af710fa514c24a7
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1