Malicious PDF — malware analysis report

Static analysis result for SHA-256 8877d819d800e61d…

MALICIOUS

PDF

78.2 KB Created: 2021-07-15 19:36:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2c510fece4db758ad061c292db97585 SHA-1: 33ce7ed574cba3ce57a2742d0dfff674ae1fd81d SHA-256: 8877d819d800e61d536880934d4d18cf89da3641243f64fab9ec0d37d066c9ef
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to 'crysiq.ru', which is likely a distribution point for malware or a phishing page. The presence of a 'download button' heuristic further supports a social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/square?utm_term=img+to+pdf+converter+for+pc
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec81467a1add4dee1f4e46/1626112327087/94724685931.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ede56b7979814f85a92377/1626203499451/41897937582.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8f0af91837287387a703/1626115850416/zajotomi.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60eff5d41a40e71890516189/1626338772789/nobifumoxezowobewogesedut.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8ae130b0a554989ed33c4/1625861652087/vunaputebokusikibesivu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eda2dcc0b9b61b59752622/1626186460570/lodelenajisenivev.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8e1ec81c37306b2f679f/1626115614745/gunoxokusumuvajebo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec840759713006cbe180e7/1626113031900/fake_learners_permit.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8fcc0e7a3c5fba3e7065/1626116044647/vudafabod.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8d6c5efa1bb2f5074e3e8/1625872069976/how_to_draw_fast_and_furious_cars.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ede599a4137771ba02ecfb/1626203545824/91688509094.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e42c3b7e7c63344cc10d/1625875500236/79082107144.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_off0000d263.bin
ffcd820d2ff805ea27e76fa8778b4c2d25c5cd04fbbc07a60f8dc5a04f49d070		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 16368 bytes
font_01_sfnt_off0000fcc8.bin
164c9a9f22b026b5ab5c4f89a4501598730c4089539def9e582ab5d3f0111dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 10512 bytes
font_02_sfnt_off0001147b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 16792 bytes

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