Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f71b5be8d547116…

MALICIOUS

PDF

84.5 KB Created: 2021-07-12 20:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 610ed9734fedaa260ac7b3a964e29b4f SHA-1: 787f32136bd66ca590b8371901f8f32f0133e484 SHA-256: 1f71b5be8d5471167f48b29080a8e230bcf9ce5f5d556901eb641c09a71b1b77
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded URIs that point to external resources, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the presence of embedded URIs and the ML detection indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8440

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/-7-cX3opz_8/square?utm_term=dicyclomine+and+gastroparesis
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7aeca86d8930991a3fb1c/1625796298955/travel_books_reading_answers.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec71baad4a1a22a3e59eed/1626108346730/madeludiri.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e9603ac14ff043cd5eaf7b/1625907259107/another_word_for_keeping_track.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e86c80f67b8714f8047450/1625844864420/watch_50_shades_freed_online_for_free.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e800747d3b385c94b70551/1625817204400/leborifagotajo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8a13e171439398e0b2ede/1625858366419/my_best_friend_is_mad_at_me_because_i_have_a_boyfriend.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_off0000e8f2.bin
30a536aac8acd2ae3e4492af4a8f0df2642a31e617cb0770c225788eb6dab675		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 10972 bytes
font_01_sfnt_off0001022c.bin
b99a2d9be147dc5993562fd29f7d154961bea5a9dfe121a120e6763c481a1aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16756 bytes
font_02_sfnt_off00012dfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFC 16792 bytes

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