Malicious PDF — malware analysis report

Static analysis result for SHA-256 209ed16591ca506c…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 09:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09b8c1e2f956c1227d9ef4623f37319e SHA-1: b32e7f4f2fcc1694b5ebec532f76ca54131434e3 SHA-256: 209ed16591ca506cc52b3430ae01bdce3737ca83b491637592328b1f83726409
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, including one identified as a link farm, suggests an attempt to redirect the user to malicious content or download further stages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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://namhungholdings.com/uploads/ckfinder/files/73178110194.pdf In PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27b00c431---46421987300.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/21316645086.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/28589214596.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/30758888380.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e2a023f9ce5745bc6a6561b09eab0074/71035831392.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/gufuzesobewosirobo.pdfIn PDF document text
    • http://ibb-online.ru/f/file/pudogotek.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210903150248.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/23436571928.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/69156409593.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/xusaje.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/rulojaduxuxitevuxun.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/8772142164.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/37301618135.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/wunuguxaturavubifefiw.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/68320939842.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210913192020_8oyn1o.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/zuretapijisufejonude.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/60420112470.pdfIn PDF document text
    • http://imaginove.eu/data/Files/26059130434.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/rawasalolonamomonepag.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/balavapisekubewijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=falcon+squad+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_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 17372 bytes
SHA-256: 5462b2300fa513541ffd05f046ac8c26363cdc8d566e38208dbd9f9a56f6b7c6
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 10248 bytes
SHA-256: 6cd40d8758767c6016294a2d7b68fe6aa7650fafdae7160d9ddaf70f9ee2feb0
font_02_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1