Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3f170ce8b1751f…

MALICIOUS

PDF

71.8 KB Created: 2021-10-09 22:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2a3210864a1ce1d891ab32d974a76a03 SHA-1: be889fbde7a82437149706e167776b9aa7ebfa77 SHA-256: 5a3f170ce8b1751fc9580f325698228f940544ca189efec199a54dcda31d8b32
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF structure point towards an attempt to redirect the user to potentially malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studiotecnicoligioni.com/userfiles/files/38627475043.pdf In PDF document text
    • https://ctapigroup3.com/contents/files/53472750176.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/25598897337.pdfIn PDF document text
    • https://temahr.hr/files/nulerogimawaw.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/15812516659.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/26999627728.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/6oji1s4859idpil147gqausmv3/92040083593.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/73286499721.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/13364498406.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1633522684rZe7.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_235237.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210911092457.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/37620889980.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/72812055042.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210909_1276B234ADE6C224.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/kujuzofo.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210919/file/resosibezedikefirobineze.pdfIn PDF document text
    • https://renetravel.ro/images/files/65812309107.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f542f2fea4---33110143074.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/sagekebumafuriraxi.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/pugamunetufojaxidalazak.pdfIn PDF document text
    • http://17njl.com/userfiles/files/22021269921.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/37737453111.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/71601819256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=contax+t3+manualPDF 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_off0000b60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 17420 bytes
SHA-256: e315e09dca93c80319ea23f4f5031281931c1c5815db82c68c2aab7e1da37b6f
font_01_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 10184 bytes
SHA-256: c5e4b43d60bbfa8eace0e14aaa74b23682f84b0995c6cee94664e2866ef97e55