Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b501dafc833c2f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 06:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2228110b5c825546fbc6a69e3ae1fa9 SHA-1: 478c45de41e3bec22fe36c754ca88c5baa415666 SHA-256: c4b501dafc833c2f3f8cc2d9af1545d5ef4793ddd042c9e7657ce5e26fc99b14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to potentially disposable hosting, suggesting a link farm or redirection mechanism. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abwingsbuffalo.com/uploads/files/14255122191.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/72883424357.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/70270283364.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/40714381288.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/86718690053.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc40f827cc---91309492903.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/vuzozifelosixetox.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/baxizog.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/83371408407.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/gilavupiwu.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/pobakutiw.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/pakaluro.pdfIn PDF document text
    • http://ropesadventure.com/d/files/voxomokizajekibijajided.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/jimemegizubepofe.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/79205820272.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/nuwudezok.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/7907137689.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/818505818.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a19a505c3d---figefekibe.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132254843329---78628960680.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/tenetunusuze.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/66654842664.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/68404227034.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/57751653898.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210915_E98F7146CF3C6C4B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=scan+qr+using+iphonePDF 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_off0000d9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 10832 bytes
SHA-256: 71e6c7373a4d2dd0342ea5aaa078ebd17e90256fbc1362d877593f24b433d769
font_02_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 17420 bytes
SHA-256: 99aba6387c1cb23396e2d794fab5cf40d697ba8c242e12b3c7d96573a30f980e