Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0052c1533caa1da…

MALICIOUS

PDF

82.6 KB Created: 2021-07-20 13:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d10110879b971508e76c93ad7bad9f4 SHA-1: 5a331a2d2e6f4104a64291e4798d9833bcfc4568 SHA-256: b0052c1533caa1dadb401e713cf19dd56409eb98086a12a32407d3292dba42da
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier assigned a high probability of maliciousness. An external URI, 'https://laborke.ru/square?utm_term=tofu+made+out+of', was found embedded within the document, indicating a likely phishing or malware distribution attempt. No scripts were extracted, but the presence of the malicious URL and the detection signatures strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/square?utm_term=tofu+made+out+of
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ee526202e0767984f4d9e0/1626231394425/98554237155.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f675f2514b21793b5082e1/1626764786575/are_pistachios_bad_for_dogs.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1374e4bb49071de1a28bd/1626421070635/22837518534.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f6a2c9cf25774cb687486d/1626776266051/7685337288.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f4c9e89c57c249394c6f12/1626655208740/febekiv.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec782b154eb17b6848df33/1626109995895/22615439041.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f256fede9f7d6ab7b1b977/1626494718658/xofanotidotepeno.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f06fd978351f77a075d0be/1626370009724/zeneduke.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f505e2c5d9e6782cf58606/1626670562530/anxiety_and_self_awareness.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0fa25b238236d2330d48c/1626405414022/gixerolejubuxenetezumu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e94120309bd63f3d870b91/1625899296594/bokuwawoxutuxewoluri.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0df876e32095df97fbd6b/1626398599154/word_equations_chemistry_worksheet_answers.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0650d3576e9290f929c07/1626367245563/sucrose_and_fructose.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_off0000e52c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 16792 bytes
font_01_sfnt_off0000fd43.bin
17621eb770d840582a1ddff3d7a942cff1b1a797de7584d8d70236db88765373		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 10068 bytes
font_02_sfnt_off000113b5.bin
da7009bdc1358dc87ba8b1a723d7f85d27d1302316f8408b0366f84f1b446eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B5 16444 bytes

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