Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ecdc2ce703b2c8…

MALICIOUS

PDF

76.7 KB Created: 2021-07-12 20:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05d39b294858d7490d2e12853178fe56 SHA-1: a43ab58ea31d2570e1afedf7f6b1ec86f918b8f4 SHA-256: a0ecdc2ce703b2c8a94395a459243f766c7af421fc7017d9dcf956211906e156
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains an embedded URL. ClamAV and a machine learning classifier flagged this PDF as malicious, specifically as a phishing trojan. The embedded URL, 'https://krisoc.ru/square?utm_term=find+the+equation+of+the+line+that+passes+through+the+points+calculator', is likely used to redirect the user to a malicious site. No scripts were extracted from this sample, but the presence of the URL and the detection signatures suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7691

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://krisoc.ru/square?utm_term=find+the+equation+of+the+line+that+passes+through+the+points+calculator
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e895caa939df2b14d920b3/1625855434226/macroeconomics_true_or_false_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e92ba60a287971af9a4f64/1625893798628/the_earth_is_the_only_habitable_planet.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8f71a12fb7d0b27918f08/1625880346174/have_a_fabulous_birthday.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_off0000ca3e.bin
a3cb9192bb6b2b4ec610595fca40c9ef275ada4e63ad2d44f3c568d2433131c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 16388 bytes
font_01_sfnt_off0000f510.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16792 bytes
font_02_sfnt_off00010d27.bin
7b5dfb0a551ea526b1794ac40e73e0b1d85813c933018d75744a2720e2139571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 11124 bytes

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