Malicious PDF — malware analysis report

Static analysis result for SHA-256 538934e97b6e48a2…

MALICIOUS

PDF

77.1 KB Created: 2021-07-14 08:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 667815d69a39bccab80c0e15a2fd3f40 SHA-1: dff58aff3ca7690de2143cdbc6d1d7aa32d1789a SHA-256: 538934e97b6e48a2d8db193cf920cd9d8b76534a3f18c0a2ad08d743073f6074
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'pistant.ru' was extracted, suggesting a phishing or redirection attempt. No scripts were extracted, but the presence of an embedded malicious URL is sufficient evidence for a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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://pistant.ru/square?utm_term=where+do+fashion+trends+come+from
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee6334df274736e0ae036b/1626235700990/add_signature_to_in_preview.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edfe26895aae42f65da682/1626209831023/wuxires.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee33ece9cbfe6c2fe76c46/1626223596635/example_of_excuse_letter_in_school.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7d91f5eabb22f35da8c2a/1625807135856/two_word_verbs_exercises.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e29700aa07a7894516b/1626111530191/vusolemefatiwopemagujinog.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca3ede4ca3800a11acadf/1626121198039/piluposu.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e79f316d117d6eeca0cd77/1625792305963/76666882832.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_off0000cf45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF45 16792 bytes
font_01_sfnt_off0000e757.bin
fd77e4a19ff683d92ad0ddd1be7e7e3eaa23a70704c0c5cf3874096656e2eeea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 15844 bytes
font_02_sfnt_off00010ffd.bin
7dc501073c00daeead97570e893fb506452e3d327f03b126d341243ecea134e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 10688 bytes

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