Malicious PDF — malware analysis report

Static analysis result for SHA-256 71190e3d09b2f7ba…

MALICIOUS

PDF

84.9 KB Created: 2021-07-14 03:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 772d3b2ae7390fcd67e31797b4e9c95e SHA-1: 9ea760e278cfa482a3f26337c83a90904079df0f SHA-256: 71190e3d09b2f7ba6724cfc6958d1785947d40a2f1bc239d61d58b7ab611a98a
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The presence of a QR code lure heuristic suggests an attempt to trick users into interacting with the document via their mobile devices. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a potential for malicious redirection, aligning with phishing attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://feedproxy.google.com/~r/sq/ugae/~3/0YvHz_IItD0/square?utm_term=react+native+for+mobile+development+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee1f5be9cbfe6c2fe5c14b/1626218331677/fojemumiz.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec9559934d360eb289e5ea/1626117465198/vigagifiwumawazet.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7714a3e9df788e6c1702/1626109716833/p0344_ford_f150.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e94015563c1506a8b71b8b/1625899029297/are_there_we_go.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8fe2a5ebba154a8fab047/1625882154871/mudegowenuzukanade.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed1f7cc50d503b9d54f694/1626152828426/38618506169.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e89084b14d1431991a3ffd/1625854084687/gexejatilek.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e77ccd95336864b54083d6/1625783501957/62124155293.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede2d5ea8d40126a1c7bb3/1626202837364/81657400037.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_off0000e72d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 16792 bytes
font_01_sfnt_off0000ff3f.bin
981d0beb718d07da3a6cd08e2f464e195138f50d2d18ffa5bc15e5f6f3ca1ceb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 17848 bytes
font_02_sfnt_off00012e7e.bin
fcd6067967d75012c44f02a68d707d31ebdcecd943bbd76f0a5190053a436685
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7E 10864 bytes