Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c539729452d88f…

MALICIOUS

PDF

137.1 KB Created: 2021-07-12 20:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a80d1c240746513a5d8452f93225d865 SHA-1: a30793c49d8d62e936b3850300f0ffd68d581566 SHA-256: 76c539729452d88fc27be1853abdff439f12dda28966f77c779040e7421c7ffd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://chcial.ru/square?utm_term=which+cause+typhoid', which is the primary indicator of a phishing or malicious redirection attempt. No scripts were extracted, but the presence of the malicious URL strongly suggests a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7663

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/square?utm_term=which+cause+typhoid
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec806c7e5cd11affccd2e0/1626112108550/68019125421.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec7e3a72e2584f2462b48a/1626111546808/bewageravilomuvov.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7907ad1bf7105ccac9e7/1626110215389/i_want_to_dissociate.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e94483e51f1f218d6b1910/1625900163912/growing_roses_with_potatoes.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7a787726b430b4673f20/1626110584689/walufemu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a3cef188817f7e078a5/1626110524415/42923463280.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e477726b430b467bf3a/1626111559305/free_robux_hack_2020_android.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7addf80504e0a7766e9a3/1625796063674/rivirivibujasusadev.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_off0001b52b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B52B 16792 bytes
font_01_sfnt_off0001cd42.bin
f15c525e3288179a10842b0ba2572e393869ee5dfceeabff260fc9031885d102		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD42 10568 bytes
font_02_sfnt_off0001e59a.bin
f66c72c600f7c44233ea94742672d98aaa9b25a04fd9f4f79081e7829262a54f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E59A 20112 bytes

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