Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16d4b800db5212e…

MALICIOUS

PDF

75.6 KB Created: 2021-09-18 17:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b6d63bfb29fe203b9ce7e0307f2d608 SHA-1: 5d8435ea0fa8262c1f96e9eaf12113b0b11f57b5 SHA-256: c16d4b800db5212efa8f1b2f2132491404f932601987b1a1f83a32d75869db5a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious verdict. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://drafthe.ru/uplcv?utm_term=how+to+find+wifi+password+android
    • https://tmtteks.com/files/81655720824.pdf
    • https://bluza-shop.ru/content/File/rusex.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c62db79d94---98241854592.pdf
    • http://evaemlak.com/userfiles/file///14518673637.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/67663998662.pdf
    • https://fptica.ru/images/file/kexosel.pdf
    • http://turksebruiloften.nl/userfiles/file/naxikapusumexesazum.pdf
    • https://philly.drinkpoint.com/uploads/files/92456617174.pdf
    • https://vnycc.com/userfiles/file/43929106180.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dogokalufupa.pdf
    • http://rebeccafantarchitetto.it/userfiles/files/65371908232.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/rijakotodu.pdf
    • http://asja.ua/userfiles/file/refevug.pdf
    • https://aspirecambodia-edu.org/userfiles/file/wifovefuxifot.pdf
    • http://shepardinteriordesign.com/rw/upload/file/komamasa.pdf
    • https://learningsolution.ca/userfiles/files/pidawoli.pdf
    • http://www.vegagastro.pl/upload/file/40872403707.pdf
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/20000226193.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132189ec0ffb---95496218900.pdf
    • http://hqshop24.com/userfiles/file/27975804919.pdf
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/nudaxexezutozu.pdf
    • http://quetthe.com/upload/files/karotavuw.pdf
    • http://atel-j.nl/uploads/files/76059291720.pdf
    • http://pathtojanna.com/userfiles/files/13315199907.pdf
    • http://inbeeldt.nl/userfiles/file/23169280924.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_off0000c2b1.bin
595c791770deb4ada16cc273d19cab3027a8280050ac4b957bc15547e347ed07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B1 10392 bytes
font_01_sfnt_off0000da50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 16792 bytes
font_02_sfnt_off0000f262.bin
6bda94f9d6148f5dfcf8ac8239212d4565701f9de11f092f8c1914362b8da97c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF262 17816 bytes

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