Malicious PDF — malware analysis report

Static analysis result for SHA-256 b492b77a947434f6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 15:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb12723304be7e05bdd43707423e50c7 SHA-1: 3a58292fb374a3b10b4c62e6450d52d93f943057 SHA-256: b492b77a947434f664d5f05bd362e8ec2b9ad80c81e590c5d17a03fcc2a22255
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sdes.in/uploads/49527930533.pdf In PDF document text
    • http://archifolder.com/userfiles/files/98106297604.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/70627912723.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/68205754431.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/vagizijunipapavone.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/89354260631.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/16960285453.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/rejijasomewedaxajusegorev.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/576a7fc006b7ee8d215b050481ace5c6/zidedivenadomifomabope.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/32827373168.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/banimonerupeluxa.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/50352647620.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/xebamipuwidilenipefedepom.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/20380714359.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109082150095701.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/rafidu.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/muvitasimuvom.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/vesetojekawa.pdfIn PDF document text
    • https://cityface.cz/res/file/jitok.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/53080707092.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/giwisosijawesumuvo.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/95506153464.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/39250711626.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/mivezodetelusule.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/jotaturet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=restore+iphone+contactsPDF 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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 10472 bytes
SHA-256: f902de8e13abdd292a2ee0e36224eab10c4e550feb16640fd790b0e9406dc8b6
font_02_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 17124 bytes
SHA-256: a3d9befc8eb7fe356063fb01e0c2a965982a91b43646c7f704690e2aacb96099

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