Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b6855c8996461c…

MALICIOUS

PDF

78.5 KB Created: 2021-07-21 04:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5cecd606ae1a889c9d24dce6cf90299e SHA-1: 2d7ca2d1d190e95f52544724e12d2832cfca1b05 SHA-256: 88b6855c8996461c0418beb752a309f9b6b8f7b4e87f0fc99a6c896faefdab48
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 an embedded URL pointing to 'https://ketchas.ru/square?utm_term=belching+and+thyroid+problems', which is likely a phishing lure. Although no scripts were explicitly extracted, the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8314

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://ketchas.ru/square?utm_term=belching+and+thyroid+problems
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f51af529712869f07ca1af/1626675957397/5907867430.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f2cf59a047b636121e7623/1626525530041/wupenemaporisuve.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f1f8eb1147e5557d901fc9/1626470635467/famirimosugiwokem.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f7566cb1738b698dc0dee7/1626822252743/bizawopifilutufu.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edc5d7537dfa2004022242/1626195415910/class_equation_of_s4.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f13e89da20a917db50ac6f/1626422922044/acca_manual_s.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_off0000d1ea.bin
b805fd2656ab221619bf076df23993b268d7277d2c1b018cdda6307f4bfd0656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 16388 bytes
font_01_sfnt_off0000fc6d.bin
089569ae3d4be50ed882db0585be5d4a12254dca4f7f08a428326cbcc0a71139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 11268 bytes
font_02_sfnt_off0001164a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 16792 bytes

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