Malicious PDF — malware analysis report

Static analysis result for SHA-256 add52fa7f26091cc…

MALICIOUS

PDF

76.7 KB Created: 2021-07-12 21:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 504c960fd972ca30ab161b00f5de1751 SHA-1: fb8133b5b9a95cdf189459d47be14cc021d77c78 SHA-256: add52fa7f26091cc97010acae3fc6943662f70fc09fa8d14dfa20e41665b08fa
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. The presence of embedded URLs suggests an attempt to redirect the user to external, potentially malicious, sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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/gOBB6uaVNRA/square?utm_term=8th+science+new+book+guide
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e86013a131fa493c413a52/1625841683274/metexujuzosuziwexigi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7a80fd54eb070824e37f/1626110592966/50968047847.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec7f74e94d7a30e054d205/1626111860818/spacebar_counter_in_10_seconds.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8fab1cff58014d54b270/1626116011694/43106404673.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec705019a16f038d606cbf/1626107984258/30367938088.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_off0000c87f.bin
9835badca6007b7bf954c7d4330e5888dcbc1bce1d8cc604823cff52cbf3887e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 16828 bytes
font_01_sfnt_off0000f447.bin
d0921bb04e460988cffc004a0e0343f86db30dc6ddff78363727b6d9a94b735d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 10868 bytes
font_02_sfnt_off00010d3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 16792 bytes

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