Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bd3232a21ce0b7…

MALICIOUS

PDF

75.2 KB Created: 2021-07-18 03:40:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f1afa9a98adecbfcb4f6ae4b8560f6f SHA-1: c900fc9841aaf794e2f1ffc9c0b5d78b7972e905 SHA-256: a8bd3232a21ce0b7db0f0370891b554d0d215b590870104469369beb49544b72
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing attempt. The PDF contains embedded URLs that lead to seemingly benign content, but the overall structure and detection suggest a malicious intent, possibly to redirect users to a phishing site or download further malware. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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/~3/1LSSs5qy-i4/square?utm_term=symphony+number+5+piano
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e805e2e8ef4d41b4fc6e73/1625818594337/supraventricular_tachycardia_meaning.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f2f593deec5816202a69f4/1626535315498/69646713825.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f20fcfb84a576e6cf35ed8/1626476496075/sujomilumodegovixuxiketu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f05d577affba70db7e2c9a/1626365271805/usa_today_up_and_down_words_answers.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f0c07d3710375a26a1652b/1626390653291/60497182253.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edbd0eb6836a6935f2a784/1626193166483/library_management_system_database.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f209c88cfcbd015c1185cb/1626474953106/52261346863.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7ed4e1873c46ac93a57cc/1625812302600/82184554543.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e843aabf61d063766b23e5/1625834410683/find_the_smallest_4_digit_number_divisible_by_18_24_and_32.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_off0000c4e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E0 16792 bytes
font_01_sfnt_off0000dcf2.bin
7f370d7dda4cb81583f2641688ef6efb7719b22c01c7e5f89ec2865e7f3a1e7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 16776 bytes
font_02_sfnt_off0001087a.bin
7e9cc52ffd419ce490708b200543cb57da67f4a3259b284848ab084f797092e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 10768 bytes