Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb056012ac80c212…

MALICIOUS

PDF

77.7 KB Created: 2021-07-14 01:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1edbf328f5935268bb41faafa3a142d7 SHA-1: 074a7093d9709f206a1b2b839bec872c8ee8d88a SHA-256: fb056012ac80c2121aa861eb47ca218d901bb8c9cad70693c0c6ba482dca4d1f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of an embedded URL, specifically 'https://feedproxy.google.com/~r/sq/ugae/~3/r_nBws6J8g8/square?utm_term=how+convert+pages+to+word', suggests a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/r_nBws6J8g8/square?utm_term=how+convert+pages+to+word
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eda9952d9f403b5212c0d9/1626188181512/what_factors_of_48_are_multiples_of_4.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e86d13217a5734854a16d1/1625845011173/35685237547.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec98ac69d4b6336148d90d/1626118316928/new_super_mario_bros_download_pc_game_free.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_off0000d07a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07A 16792 bytes
font_01_sfnt_off0000e891.bin
9395bffc142561e55b711deb2b2f4a30f76572b39e34313d83a694459ec1fb83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 10696 bytes
font_02_sfnt_off0001010d.bin
8e3ed499b1c38f956aa14b3fce6aa85c9bfafd1c70005ac6327cb81e97560272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010D 16216 bytes

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