Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d642f676a2655a3…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 17:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fddada14fd937c5e21f335af4cb24d86 SHA-1: 04f89ff7f4d626149e969cad5ac8a62e1967e020 SHA-256: 4d642f676a2655a32091ebd344034938bdc82b207c0516fd54f1a9bd5e3ef63d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with one URL identified as a disposable hosting link farm. While no scripts were explicitly extracted, the PDF structure and the presence of embedded URIs suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gelateriacool.it/userfiles/files/nikuzijarirop.pdf In PDF document text
    • http://club-integra.ru/userfiles/file/39631354710.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/razobubogaguwewaras.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/xobasavasivixojakifunux.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/zatugurosuritime.pdfIn PDF document text
    • http://www.siposferenc.hu/html/tebigusopu.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/newiwojunovifa.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/49685147495.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/sonaziximekini.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a97fd7637---65040034862.pdfIn PDF document text
    • http://theponghop.com/upload/files/38268866705.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/82490839172.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210914145646888.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/65520965039.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wevigumuvoludaf.pdfIn PDF document text
    • http://kelakewangshangduchang.a9188.com/upload_files/art_files/files/20210915_160925.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/60111873374.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/bajibaruxobap.pdfIn PDF document text
    • http://terlickodds.cz/www/www/fckphotos/file/wifetazogajerumidin.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/jatiloxivanexetomadaz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1f03865b667fb2c89d6071e17ede5408/35443794140.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/kemikelokobotaz.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/lemomoremofifutipogus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+block+a+private+number+on+my+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_off0000e4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 11096 bytes
SHA-256: f142e6c0b5f604e5d02fe0ce5e0b4e3e613b3594610339479958d218da67c768
font_01_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11680 18388 bytes
SHA-256: 61a1c8c81665ea1a18f63afef09c90b7886a4082f6f59610363eb35f4281a435

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