Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f017682c4be87b5…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 11:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6c73d224f3d07515d6d1dbce389b6f8 SHA-1: b9f22e24595360291f5eaad8b4412af868df36c2 SHA-256: 0f017682c4be87b53f1e5b800f312f17ffbd4ed2d543d42858f8eef9f79d13d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://gz-chengeng.com/uploadfile/files/kobixerasopo.pdf In PDF document text
    • https://cupanghitam.com/contents/files/zivuzozok.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/67040069440.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/xakinijapatedudijam.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b75929847---68733978401.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/lujepe.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/dubimupizimaguzuze.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/65840926732.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/18524061726.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/nejupifomoz.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/begemus.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/novowusuvebax.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/15410128853.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/98240542835.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/wenije.pdfIn PDF document text
    • http://agama-rc.com/upload/files/loretati.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/20246690470.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/50248647081.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/82254474149.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/62731143605.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/lefemufakejege.pdfIn PDF document text
    • http://samtekelektrik.com/files/461748960.pdfIn PDF document text
    • https://profm.hu/files/file/migug.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/fiverinigapesefojexe.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1f4605d8---kizujirafarixezixaje.pdfIn PDF document text
    • http://kisito.com/userfiles/file/63702797065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+plant+cell+basic+structurePDF 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_off0000cc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC01 16852 bytes
SHA-256: 8a81d89fceb80edd6dde2fe5dced466105c72b048d1eb3feca5edb6334ef0467
font_01_sfnt_off0000f79f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79F 10556 bytes
SHA-256: b0bd8f2142944d5acc6e813d150d897c9189e7864571f59c9f0609ccb115e55f
font_02_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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