Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7d2cdb763225c8…

MALICIOUS

PDF

84.2 KB Created: 2021-07-14 00:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f761755ba2f81282be0812792acf818 SHA-1: 6b811ab015a4f9dbec3d559d033bb2e6fb0f8ade SHA-256: 5b7d2cdb763225c8a6971f3fac02af46417e4ae97c8199986a7c569a9aae1e35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically indicating a phishing or trojan behavior. A critical heuristic identified a 'Recovery secret / private key request' lure, strongly suggesting a social engineering attack aimed at stealing sensitive user credentials. The embedded URL points to a suspicious domain, likely part of the phishing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8790

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://krisoc.ru/square?utm_term=elements+of+a+one+act+play PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edff304c056a31b81ebdf1/1626210096422/lolizijazaxidupobijoteda.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e795434aaab0286a86cdb8/1625789763701/63179961588.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e4c1025aa46e30cf94eb/1625875649375/66288092636.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e953d3f229ba2ea8387e0b/1625904083411/frittata_recipe_without_cast_iron_skillet.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecd29bda1bc628e6097f03/1626133147203/56329796684.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edff38c450ee473082a79b/1626210104378/lofuvawoke.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edff0f172ba47bdac7490e/1626210063740/encrypt_with_public_key_and_decrypt_with_private_key_c.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 17220 bytes
SHA-256: d3d47ca65bb7d22e8a9e138901618b8bf4f9c7325dc0603d623e90e3a4fe9e96
font_01_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCC 10544 bytes
SHA-256: 29cada17baef0b38f043ab50b31ce44d356b41e66ca62819a2211521b994e9bf

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