Malicious PDF — malware analysis report

Static analysis result for SHA-256 c445d1db6dc4e39e…

MALICIOUS

PDF

76.5 KB Created: 2021-07-13 17:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a523018255c9ccd67565e020053a31a SHA-1: 6ae9997689c621107ffb24155e21491bf82a3064 SHA-256: c445d1db6dc4e39e426412a50eff527c063f0bbdb1b39e3920d0ea2a3a702e92
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 high likelihood of malicious intent. It contains embedded URLs that point to external resources, suggesting a potential phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/razvivatel/yapz/~3/gPkW7oTCsL0/square?utm_term=baby+im+a+bad+boy+i+might+hurt+you
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed8d182ae47d2ac924585a/1626180888675/16972238730.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e93f7d3f195e1e403748d8/1625898877250/32214069702.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e92499e370ac6322891b37/1625891993228/old_song_new_version_mp3.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e782292210503f0732369e/1625784873623/80549048367.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e843f37facf136447ebf57/1625834484006/81161433531.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e925633ba7d954d5465967/1625892195280/perimeter_and_area_worksheets_for_5th_grade.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed1c152271a75a72cf7731/1626151957851/video_and_audio_not_in_sync_premiere_pro.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_off0000c89f.bin
eb92ec0d24d10af468841c4e53c1087e782901d498961de752cfca1f2e027147		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 17284 bytes
font_01_sfnt_off0000f5c7.bin
408cbd5297cb6ccbd795616a4be91735294846a560905896481427b58c2c5205		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 10652 bytes
font_02_sfnt_off00010df6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 16792 bytes

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