Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ba9f38412ba33a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 18:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c817a9f8f5709a6c7e60c8ff766b610b SHA-1: a195dae671012be2ba1e916bedbfb1639926a898 SHA-256: 56ba9f38412ba33a95e8d48753c67fbcb2c0ec56f6c28cbb2ac0bc9272d2e658
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF viewers or social engineering.

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 https://invest.pl/userfiles/file/watepemajixuzutulimowumim.pdf In PDF document text
    • http://mingmitrcoffee.com/user_img/files/kixeso.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/72794080290.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/xadugebi.pdfIn PDF document text
    • http://alvitraders.com/files/528715430.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/53542444132.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xaveverixidigojimofiroru.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/xodubuwuz.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/28824645775.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/24077817910.pdfIn PDF document text
    • https://okazionche.com/files/kexowelikebatakawubutin.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/15044834915.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1b07f05a---nivoxafelowilalubupa.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/40768861249.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/xojolepogotasesamirax.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/27099350468.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/refizelazaf.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/20246409669.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/kuruzoxefaxepedewoxaboma.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/47331089207.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/semegifu.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/nopig.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f61a2b8f7---wamavosupawome.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/raboroli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=izombie+comic+espa%C3%B1ol+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_off0000b95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 10836 bytes
SHA-256: 0a2f61b8342bb0315a8749e97f935ee209656b707c605de87426c71dc1ed455c
font_02_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 17892 bytes
SHA-256: 0c87d958b31a9069a98e2831feed261ab3350ddac2749868fa56234a20482a10