Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b0e3e225fe9e38…

MALICIOUS

PDF

81.2 KB Created: 2021-09-09 13:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33237b717b4d06174581315b81648b59 SHA-1: 4ccd7647bd17311fdf056a18e81c44b96b27fe15 SHA-256: 11b0e3e225fe9e38c6620c86dc536e5ca3e0da4967cc095a3deeb251132569cd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggests this PDF is designed to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a tactic to obscure the true destination or host multiple malicious links. The embedded JavaScript is likely used to facilitate these redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efbf11daeb---57151146809.pdf In PDF document text
    • http://www.specemc.ru/upload/files/mitevoburopelopevoranoro.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/vufaxebewunofizini.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137820a9ec5a---sepebidodaj.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/zakulibi.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/77648313634.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/wojafifemetumitisezuwu.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/76478459404.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/vipowamejilofosum.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/79218464322.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/78337133854.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/xakinijapatedudijam.pdfIn PDF document text
    • http://airfa.it/userfiles/file/sifuzube.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/lupovekapezulifixufuk.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/63670222449.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/31029773259.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/divaderere.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/38979952768.pdfIn PDF document text
    • https://grancom.by/upload/docs/bisagipaxegapopu.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/9072909276.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/vegalas.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/71350464335.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/pesodevanel.pdfIn PDF document text
    • https://cecprint.com/images/file/20702394191.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/63119663408.pdfIn PDF document text
    • http://ccsl.asia/files/vutesexezujasixinusiloxu.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/gegaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hex+color+code+converterPDF 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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 19236 bytes
SHA-256: c1b837e385962af74745ba7d8a5c186a47ff84d1adf564ece6af37fa7e18d562
font_01_sfnt_off00010892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10892 10100 bytes
SHA-256: 98a19160884465a4645df7c9477d008172c98cd039f3e40e6ba6a9d2e425d265
font_02_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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