Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50071c1366bd9ef…

MALICIOUS

PDF

73.8 KB Created: 2021-07-20 16:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0de57fd869c3c5de4553c4cc8064e39 SHA-1: fe12665d44375b4248f947acae25ceec9dac1379 SHA-256: d50071c1366bd9ef4c4eb80e130e210a9294c02aadff90c9c8dfc8fb0462860b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded URLs, one of which is flagged as potentially malicious, suggesting an attempt to redirect the user to a harmful site. The PDF structure also shows signs of manipulation, with duplicate object bodies, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7218

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/razvivatel/yapz/~3/nCRFBnYrBHY/square?utm_term=how+to+add+alt+text+description+to+a+picture+in+word
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f5e9bfc8ddd873bb21df43/1626728895237/mepofujemipabufilazuz.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f3a255cba7b71501ea1a9b/1626579541391/what_are_the_sources_of_primary_and_secondary_data.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec8feb36ee212f66cf7fb7/1626116075938/tv_and_broadcasting.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec790912c1416d2f19ad6d/1626110217622/91227180888.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_off0000c25f.bin
605870623bbfe5e5eb0ec79f676332e4399256b358928b2c31143b76f5c4d4ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC25F 10788 bytes
font_01_sfnt_off0000db5f.bin
b86bad1db7ad835c9dabd3c2431e73b9f04a45e8870910c4f999b84301513f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5F 15600 bytes
font_02_sfnt_off00010329.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 16792 bytes

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