Malicious PDF — malware analysis report

Static analysis result for SHA-256 18531bdf11e1e2e3…

MALICIOUS

PDF

82.5 KB Created: 2021-07-15 17:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48e38edcef746e6667fe33fb4713463a SHA-1: 628612a575a59dd8e9b2916c6f001df7fb14e1db SHA-256: 18531bdf11e1e2e3f2b4275b3446ddf48b0daf97e66a3eac82a2477ba99ca8a2
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 embedded URLs, one of which is flagged as potentially malicious, suggesting a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver malicious content or redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9831

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/UQ8tT55rDuk/square?utm_term=two+faced+hypocrite
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e96718aa30721e65f10a81/1625909016960/interference_engineering_physics.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edb891cd0cb17c7631859f/1626192017789/gesasamawasaku.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7dd285eabb22f35dab867/1625808168474/it_is_negotiable.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8008e80504e0a776b0662/1625817230871/11.4_areas_of_regular_polygons_answers.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8eea68915684aa53ad75c/1625878183039/products_made_from_bioplastics.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92324854c1d3b34870550/1625891620628/28691416810.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e94b1b8fb24157da7164bf/1625901851951/dagomuwof.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee6668fc191471fc6ee6fd/1626236520906/27945190092.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edc3912e8a4a2aca76e6d0/1626194833953/fumisobijazap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c97d.bin
f0ef1754fc65d61477060e93c266406106efc1665d28d96ca496e9ac94752641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 10564 bytes
font_01_sfnt_off0000e1c4.bin
ec535b1093d41cf7aed6716a86d4ae21fd7855f1542b9195865598778b4db41b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5236 bytes
font_02_sfnt_off0000f52e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 16792 bytes
font_03_sfnt_off00010d40.bin
3af5dd720533996e9ca4094accb631a117be953aba929b1d535ba0f69b9378fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 18800 bytes

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