Malicious PDF — malware analysis report

Static analysis result for SHA-256 924028307062ec88…

MALICIOUS

PDF

81.5 KB Created: 2021-09-22 19:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f3e8516e18000253c70f76975dfda80 SHA-1: 2b7975b15c29f0cec9cc476623c7fe3c9b591e1c SHA-256: 924028307062ec882b2466937bf6c565bf7be0c937314cd29cb314018737e206
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious content. The heuristic firings for 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'SE_QR_LURE' suggest a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://synerhu.ru/uplcv?utm_term=qr+code+scanner+in+phone
    • http://support-cmu.com/filedata/file/11014930277.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/23040347657.pdf
    • https://camelcarpet.org/d/files/39188849540.pdf
    • http://sun-green.be/ckfinder/userfiles/files/7620577833.pdf
    • http://idolyokocho.com/js/ckfinder/userfiles/files/pinoxaxisurojezilujatezak.pdf
    • http://mgrima.com/files/file/80206296121.pdf
    • http://sun-green.be/ckfinder/userfiles/files/jisopiso.pdf
    • http://djpress.pl/Image/files/razedunepitasagebuluroso.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365e3d150e1---20420135721.pdf
    • http://barsugo.com/ckfinder/userfiles/files/36789595991.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/14195432509.pdf
    • http://quangcaosmsgiare.com/media/ftp/file/fazuxitufaninagirag.pdf
    • https://iqmuseum.mn/uploads/files/34650057495.pdf
    • http://mbeautyconcept.com/upload/content_images/file/nizox.pdf
    • http://ekhoron21.mn/uploads/files/21405814234.pdf
    • https://libertyrealestate.in/ckfinder/userfiles/files/supazixesovumup.pdf
    • http://meadescafe.com/userfiles/file/daburovejuzarut.pdf
    • https://rwd.webseo.tw/upload/files/netofim.pdf
    • http://studionegro.net/userfiles/files/fanotalifiwim.pdf
    • http://freestyler.cz/img/file/79472503736.pdf
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/nozigimu.pdf
    • http://studioboscono.it/userfiles/files/63959497844.pdf
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/jezibonagakabo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da97.bin
9b20da742a982f279b4fcaba9dc43f1e127fcd0a3e6a19ead256f5184947b51d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 17736 bytes
font_01_sfnt_off0001088e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
font_02_sfnt_off000120a5.bin
6ea8fbf481d1c70177671499e3361910c0922656afe1fd3ae840734364f23704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 10528 bytes

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