Malicious PDF — malware analysis report

Static analysis result for SHA-256 3001693c1bbd019b…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 19:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cc380553c2075ae9dffbca875f37a82 SHA-1: 033d1d9c31b39c019c459797f53a3cf0469593a3 SHA-256: 3001693c1bbd019b986fb5dfa3b4bcdf92835df9bc13a744a714d280d9277b8b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as a legitimate file. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chalappuram.com/userfiles/file/13719853097.pdf In PDF document text
    • http://whuntex.info/userfiles/file/1898913202.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a0857f68c---sajuzov.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/32432903045.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kenoxilitadabil.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/kukavububozudiziwatow.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/jupomabat.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/kigazuxiluzabonepepuxako.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/5801359732.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/18643757437.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/1901579164.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/5038082913.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/kutezoluxedumupomog.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/21634215287.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/malakaxazolevif.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/sitededosilerirobeni.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/molonoxubujupopitofap.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/73a50d2bdedec1ba55be64ea523b45cc/nogupajevewe.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/fawokodaxapuxifisur.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/soradexige.pdfIn PDF document text
    • https://ms02bet.net/contents/files/96635731141.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/napuwepamap.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/10880722815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=vob+to+mp4+converter+downloadPDF 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_off0000d0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 16848 bytes
SHA-256: bc20af244971ab0e85186930a40f38df60308f166950f9d3e5362e8a4c422e88
font_02_sfnt_off00011496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11496 10756 bytes
SHA-256: df43fb878242fa8f4059828c3cf4cf8d3f9ab1453fccc32dd78ab5658b950a72