Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8a256335d63b7b…

MALICIOUS

PDF

111.7 KB Created: 2021-07-13 03:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3a22ba3d5acec783208a1f46e4b25e3 SHA-1: 706dd5867ffda6da6402e73c98690315b5a6733f SHA-256: 2d8a256335d63b7b34849383f935e0ca01495ab5bc757591f0cedfc722f7ffdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and a critical heuristic identified a lure for recovery secrets or private keys. The embedded URL points to a suspicious domain, likely part of the phishing infrastructure. No scripts were extracted, but the PDF structure and heuristics strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6083

Heuristics 5

  • 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.
  • 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://irlanc.ru/square?utm_term=labview+core+2+course+manual
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e80a7b28bb5f4f516551e7/1625819771164/the_breaker_new_waves_scan.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec71344c0b954f9ea25f8f/1626108212817/luvogepekobo.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8f4a83836e7a7d61b99b/1626115915095/graphology_in_stylistics.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecc6adc27a210cf2bb52ae/1626130093136/54319901167.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_off000148d9.bin
0d4559ce34aaff8912e879347a9ee3a3d8004b4ada4484d76179cf3ce1b19431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148D9 21796 bytes
font_01_sfnt_off00018223.bin
2c5276723f4272fd7f384c507071c73e0498c41b20c3793d5386e1d6d7709410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18223 10764 bytes
font_02_sfnt_off00019b00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B00 16792 bytes

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