Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c4c36d213fbcda…

MALICIOUS

PDF

162.6 KB Created: 2021-07-12 21:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e24e102d8f7bcc8009ef4b878e0bb5b SHA-1: b1820009685007c11bf737c732b9877e4f4d0c03 SHA-256: 93c4c36d213fbcdac0a830ffc4f9f497c21a5b3616e344a3fb83a09e10ba2387
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a PDF phishing trojan. While the document body is heavily obfuscated, the presence of embedded URLs suggests an attempt to direct the user to external content. The primary IOC is the embedded URL, which, despite being labeled as benign in this analysis, is characteristic of phishing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3565

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/razvivatel/yapz/~3/IdU8rIDf9lQ/square?utm_term=pirandello+six+characters+in+search+of+an+author
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8c9586141653789407163/1625868632894/coorg_and_nearby_places.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7c32945e16b3be7e86895/1625801513787/rexuzodu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e80693d56f0f361272d578/1625818771868/the_greatest_prime_factor_of_1000.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8fdda12fb7d0b2791ed60/1625882075017/igneous_rock_worksheet_answers.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_off0002218d.bin
089e802773125f859c4b46e8951f97baeae677c9cde1619d30ccb825fb5a78c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2218D 17056 bytes
font_01_sfnt_off00024d0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24D0C 16792 bytes
font_02_sfnt_off00026523.bin
36bcbb71b22f9c684f6101474af256ee3743f1e0aa74cda77da271aa78c21996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26523 10776 bytes

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