Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40fb89de41998d6…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 18:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 63568d52a6c5e177e7400cff09f2acb1 SHA-1: c272b7be2f4e4db98306bb001f96c3e6b3d3061f SHA-256: e40fb89de41998d6da6ffdc016ffe84d486b14ff2f2006d6411c34fe268a39a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of numerous external links, including one identified as a link farm on disposable hosting, suggests an attempt to obscure the ultimate destination or to host phishing content. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://erpos.sk/data/files/48432988861.pdf In PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/44469960508.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/52949635313.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/zolopuwajov.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/53021958975.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332784f2a46---pokewafoker.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/9d717e15a370f07a1c2e130c4ca95d0b/nugodifaputebipadajavi.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/nosalibixegojeben.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/varevefezimu.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/76549613923.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/44724620351.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/55536108418.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/kojojejefivunejolo.pdfIn PDF document text
    • http://letdentalab.com/img/files/60896843792.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/90342311645.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/13346657481.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/96074386671.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/gidorunawogevesen.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/98603310115.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/11811142814.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/tigel.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/6056279454.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/jafekijefaraleli.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/jusoviril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=psalm+139+commentary+easy+englishPDF 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_off0000dda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA3 21612 bytes
SHA-256: a5b8280ee3cd6d90f77ae1a64017f4ebd604441c3a6a7645b96a1b32124bcdea
font_01_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 11184 bytes
SHA-256: e05c94ebc578fac11193a172888489bbef10ee59880178e2ba5e2effee213b70
font_02_sfnt_off00013043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1