Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f36364445c9d330…

MALICIOUS

PDF

77.2 KB Created: 2021-07-16 00:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff63cebc435f3513d9ffaab456951644 SHA-1: 988068567d2d0de499f8486854f448472b86709c SHA-256: 3f36364445c9d330c0473c3560e111b9467991650bcc0bb1795c0bc1684ca2a4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI that points to a URL, likely intended to redirect the user to a malicious site. No scripts were extracted from this sample, but the presence of an external URI and the ML/ClamAV detections suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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://feedproxy.google.com/~r/sq/ugae/~3/5VO7y1TeAqQ/square?utm_term=close+only+counts+in+horseshoes+and+hand+grenades
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8c7583add050c1b4b4c23/1625868120893/15726146742.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7a19fe047727940a9a35/1626110489968/show_your_tits.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee7a957dee9f188f7beffa/1626241685300/gigemeduzixuwonunegiw.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ece2e936a7a57c1cec260d/1626137321637/water_cement_ratio_for_concrete_mix_design.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7c5004b964f05b8473337/1625801984547/4_card_solitaire.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_off0000ca5f.bin
71f1796f0a702e4b76c2e05871820b1891a1be3250f1a73699ab6ae18e2807e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5F 10896 bytes
font_01_sfnt_off0000e35b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 16792 bytes
font_02_sfnt_off0000fb6d.bin
a3f6224db25a1bb2e2c3bf7000a23f9b425122f688a1ffee74a0fe39a6978551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 16768 bytes

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