Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca7d4faff826487…

MALICIOUS

PDF

83.1 KB Created: 2021-07-15 15:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 263b52e710fef6c4589998ea4ade9b1c SHA-1: 4589aecd2624e5e1c524c5285d1353200f6d72ac SHA-256: aca7d4faff826487fcbb7298aac10e8af6efc5b8501d0d219651d72eb8f895b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF_URI heuristic indicates external links are present, which are often used to download second-stage payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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/~3/1LSSs5qy-i4/square?utm_term=ohm%27s+law+is+related+to
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e82c35d56f0f36127458b3/1625828405737/learn_how_to_rap_app.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eff320fdf156014349d44d/1626338080747/geberolonisazomeso.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee796adf3d323292d3fc1b/1626241386588/kufemalipowesuxivulamosut.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8d09e1d90976278a9e3fd/1625870495093/jorewidajikowuruvowabavam.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee124c7426fb5109f1876a/1626214988957/65674948260.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7b81248fdc259403efa71/1625798674712/warm_front_on_weather_map.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee5f662d09e34b72a23975/1626234726816/45962581241.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8fab218245d33f18022ce/1625881266371/puzzling_questions_with_answers.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e844f72d909c29a8325a48/1625834743564/45050770652.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee86d72ee8b51fd9395bc6/1626244823243/66511758237.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7b72c217102653d549dd/1626110834806/easter_april_fools_day.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee54602ee8b51fd936e93a/1626231904329/4th_month_baby_activities.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_off0000e091.bin
94fdba2f529ee882b94d31d8284488af698e1e263a8d389a6b288c18c58672ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 10556 bytes
font_01_sfnt_off0000f8c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 16792 bytes
font_02_sfnt_off000110da.bin
19a945fb421f8a1640255f2302daca0935ebe68170af9faa150c46c2661cd84c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 17284 bytes

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