Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ecb9fccbc78c88…

MALICIOUS

PDF

74.1 KB Created: 2021-07-15 22:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1a5b081bafde96579d6010046b10bb3f SHA-1: 271a6ecede558e13c7d22f230a7fbeb0f0fcfaa3 SHA-256: c6ecb9fccbc78c883230ce29c65763c59f051cb7f5dc3618f63d9b31215bb475
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating phishing and trojan activity. It contains an embedded URL that, while currently flagged as benign, is presented in a way that suggests a phishing lure. The PDF structure itself is also noted for duplicate object bodies, which can be used to obfuscate malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3118

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/sq/ugae/~3/IdU8rIDf9lQ/square?utm_term=feeling+demoted+at+work PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8ec48c19ad4998dbcd00/1626115780735/period_more_than_10_days.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ede64ae83f616bcf83a81b/1626203722313/the_lake_isle_of_innisfree_questions_and_answers_class_9.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_off0000c4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A4 15340 bytes
SHA-256: 6f42473709e47dcdd144c28f30e320a0a4c0474fbb3e73eefd628cde51dd322d
font_01_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 10580 bytes
SHA-256: 2a0510fd8cf1facd0500125f7826220c52481c49307ecf14d2fc699111aeca13

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