Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5b21c2aeaf783b4…

MALICIOUS

PDF

80.5 KB Created: 2021-07-14 04:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ab265d1423f300073c46239fd6c046f SHA-1: d9e1a63404ae261844627d9f266a633ed844af50 SHA-256: a5b21c2aeaf783b4e7ac5fee43de7b9fcdca31153b4213d2861853e60b683e9f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection indicate malicious intent. The PDF contains embedded URLs, one of which is flagged as potentially malicious, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of embedded URLs points towards an external resource being leveraged for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6166

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/~3/9xivtwLAy4k/square?utm_term=loving+caliber+stay+here+with+me
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec9ad37b14134336dec59c/1626118867537/watch_farewell_my_concubine_online_free_english_subtitles.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e84ecb53d6ed6d7600c018/1625837259486/example_of_corporate_level_strategy.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e786d13422751eeaeaece1/1625786065395/springfield_ale_house.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8cf10c81c3e1fd729bd44/1625870096722/the_story_the_teacher_told_us_was_very_interesting.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_off0000d93b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 16792 bytes
font_01_sfnt_off0000f152.bin
85884896ec663b47dc9d1fdd8d6f824263a99ea2899ac30bc5041887c0b2b57d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 11040 bytes
font_02_sfnt_off00010af1.bin
176f0a5346e7051cdcb530c217e67f0a199246084bfdd0b0c40cc781e280dd96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 16712 bytes

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