Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c2595adbec0590…

MALICIOUS

PDF

88.1 KB Created: 2021-07-14 05:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba1cdb5664ebc4da53954a80a4d1c937 SHA-1: 82649b8111b24b18b7393f4908442d57b3450ef9 SHA-256: b4c2595adbec05901a70098c5bf155cba4a592eb22e69e00e087aeeeda7fcd71
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains embedded URLs, one of which is a feedproxy URL, suggesting a potential phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

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/gPkW7oTCsL0/square?utm_term=another+term+for+blowing
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e82cca4b964f05b84b4ecd/1625828554181/comprehension_passages_for_grade_2_with_questions.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec85d00d838b6c850d26fb/1626113488395/5509298523.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7a4fc69e16759cf72c361/1625793788974/normal_wbc_for_dogs.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee01b1537dfa2004084ff5/1626210737871/ruvoligutiwupatiwososemin.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7ac58d93aeb546a11d56d/1625795672957/olympic_games_2016.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7d67ff9c8b53cea1cfed/1626111335238/mp3_music_player_online.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92cecd1a1204f6c9644a/1626116814908/say_its_only_a_paper_moon.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_off0000f771.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 16792 bytes
font_01_sfnt_off00010f83.bin
ff1197c1eb810610c034a06e0b653736f3c7d2d7d11e5b99da7849f4058b6003		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F83 16936 bytes
font_02_sfnt_off00013b6d.bin
31e635e65b8127493ed9f96b72e6d2b2806e277d4e2dc9f5528fe05d8aa42d1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6D 10540 bytes

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