Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c3cd3975a41871…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 17:28:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eefbaaeb5150dd9c4796ebda5dbe96ed SHA-1: cd7ec570b092b4583ad674fda9bdb874373cf6b7 SHA-256: d0c3cd3975a4187154bb46cc7cdcad914f99c3c0238119df3fefd524fcd97b25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for PDF phishing. It contains embedded JavaScript, indicating an attempt to execute malicious code. The PDF also acts as a link farm, directing users to numerous external PDF files hosted on various domains, suggesting a multi-stage attack or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fitness-sport.it/userfiles/file/14422111577.pdf In PDF document text
    • http://manhchenang.vn/webroot/img/files/85468573988.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/xasaruzope.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614350c971395---37874944957.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/85501897045.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/30689767277.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/tumuduguzadinesixu.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/34311028456.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/fidesodivoxipo.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c4b49a64cd96a44a7aeceb4493d3adbb/52496316785.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/64173659641.pdfIn PDF document text
    • https://onlinendttraining.com/files/67913530109.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/gavukuzu.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/45479510072.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/47104523746.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/basubapixoruf.pdfIn PDF document text
    • http://beijingteye.com/upload/files/72865304334.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/gekimobenopixupexame.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/1804962121.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/75454668674.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/pulojimitirabibaga.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/18073059758.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/84531049879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+save+images+in+sd+cardPDF 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_off0000d067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD067 10808 bytes
SHA-256: 0a433bb7759a41b2071c5450450b79c6c6add7bbfb6fbec64a3626a253aab369
font_01_sfnt_off0000e91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91C 17120 bytes
SHA-256: cebded4858b5ec35d3645a89690c6ea4d4fb0dfa488012e9bf36b6a5c0c3d90f
font_02_sfnt_off0001151d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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