Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ec3b9b069e70b1…

MALICIOUS

PDF

82.3 KB Created: 2021-09-11 15:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 109116891f3bfccba3a3656ea92a8558 SHA-1: 1479d2f50f3693fd2d58b804ce1a3d655a79e5c7 SHA-256: b6ec3b9b069e70b1f06ff9492c7ca058406714f146cdadef401455bb554291b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous unknown URLs suggest the document is designed to redirect users to potentially malicious sites. The authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://serrechevalier-skifun.com/imagesfile/56349353863.pdf In PDF document text
    • http://laduses.nl/image/file/farojemibogetutepolifam.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zazarabebi.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/22800626264.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/90019479866.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/zetadonifesuzomigel.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/kekivali.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/64234685405.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f49d0deff---53994912598.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/vanixinapavagigas.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/zilunivuweresuwilisoken.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/76322626268.pdfIn PDF document text
    • http://saktigroup.in/uploads/fejivazobuj.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/92719202016.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/fadozexiwegowunula.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613546342db5f---21033792085.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/59509340815.pdfIn PDF document text
    • http://parfumland.sk/upl/bezuwuwisena.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/lunowixelugov.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/74394485583.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/60990580373.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/ropugoropitexigurojiwom.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/15698902799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=all+you+zombies+short+story+pdfPDF 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_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 17184 bytes
SHA-256: 754257a3be38bfc1bece01c7189a1ffa0471c472ba982a416ce8899eb10d20a6
font_01_sfnt_off00010a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 10892 bytes
SHA-256: 780f4c882375e5af407686ac141edef5f531cb81c1149eb17b51e9919f9eeee2

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