Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d107f813f184f0…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 21:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89fc9520e15cd87b8a8a1001699a91a9 SHA-1: 0abdbe5e0194d73bad3635c55bbfabd7898cbaac SHA-256: 74d107f813f184f0160cd5be837dd1aa9ec6a5446b6571b5d96d288419c2eb46
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of embedded URLs and the PDF structure point towards an attempt to direct users to malicious external content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=open+apps+on+my+phone PDF link annotation
    • http://nt-module.ru/ckfinder/userfiles/files/ximoxorotobaxitowotap.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/94404241206.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210918_091845.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362979cfbf9---71558959306.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/2831939253.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/texadaxab.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/79867436060.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/49113318340.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/091906387391.pdfIn PDF document text
    • https://udruga-invalida.hr/files/47601624924.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109152201533586.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/18078889725.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/50504905528.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/vuzagitonafixot.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/molinidududa.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/gixuv.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/didogipaxefasoremudis.pdfIn PDF document text
    • http://azizolace.cz/images/file/duvinaxiwisa.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/31546875689.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/monekigefefelabokimiwisus.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/65299022109.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///kesad.pdfIn PDF document text
    • 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_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE713 10320 bytes
SHA-256: a2cfbde2329aa65f1180d58d91e5ec1568d99c3f1b6d64f0353d29eddd6cb590
font_02_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 17356 bytes
SHA-256: 05610da4300582a8407de609cc7d394585b4127940b8cb067bb294f44936f406

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