Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a49bd8fe69c6eb…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 11:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0db6caa3e7258f4eefcc776903c109f0 SHA-1: a828a3190b43b75d945c5156de1dba61c0dad0df SHA-256: 64a49bd8fe69c6ebc0b94d6c543dd892bd41e78744d6e2525918a24f45fa5c19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. While no executable scripts were extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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 https://clic-essc.ch/ck/ckfinder/userfiles/files/wozatanixabedarevubokuv.pdf In PDF document text
    • http://dansensvenner.dk/imagesfile///8847345944.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/32698699134.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fef4db35c7---fabogepagudolujumamul.pdfIn PDF document text
    • https://superpart.com/files/jawesonadidukuj.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/240557121024.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/zadusibupok.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/66749114669.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/52287223039.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/39248240642.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/11208735402.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/57372552710.pdfIn PDF document text
    • http://jcpingie.be/public/files/buruxivepibonorike.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/tovugusobega.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/zebotaratixumumem.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/medixapijow.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161357c4dba5fa---vimuvimeweto.pdfIn PDF document text
    • http://placc.info/up_image/53205355484.pdfIn PDF document text
    • http://rhondachem.com/d/files/24868707801.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/gogaxuxafepodalug.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/79912850201.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/8973750582.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/7694476689.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/76709551912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=day+1+a+boogiePDF 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_off0000b0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A7 10072 bytes
SHA-256: f143fffb49dd3c5c10c60d9db08ed2b3d84b15b9666e96b68ced2c17669dd817
font_01_sfnt_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 17016 bytes
SHA-256: 171ddfc53299d40755c0ec234aa5c041af3edffdefa1c15d12f13da4df93b531