Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba66af94316b35f…

MALICIOUS

PDF

77.2 KB Created: 2021-07-17 03:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5d1cca9da4a5ae57da8a257e9735a15 SHA-1: d6b14a9993993a92047836a4d7e6f70030a31bab SHA-256: cba66af94316b35fd7bbc1d142228b7b97ee4d071bd53cc90edb13a0c0a1177b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a phishing-related signature. It contains an embedded URL that, while flagged as benign in this analysis, is indicative of a phishing attempt. The PDF structure also shows signs of manipulation with duplicate object bodies, suggesting an attempt to evade detection. No scripts were extracted, but the presence of embedded URLs and the ClamAV detection strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/-MXWpcYQ7kA/square?utm_term=ternary+operator+in+java+with+multiple+conditions
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee245d0b33b63bb8c41cdb/1626219613771/jajegenavojobar.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca13f7dc7460dd09dacdb/1626120511303/first_light_credit_union_near_me.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_off0000ca14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 16792 bytes
font_01_sfnt_off0000e226.bin
0dc1052c2310dcf9f245478d7a8e294719dc0005849cdec8af86cf313b020d39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 17080 bytes
font_02_sfnt_off00010ebc.bin
1353bf0542293d9f6fe62384d38c42ae78d902c2298076cb59d44b8b051cb4c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 11240 bytes

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