Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca5e78c3804f7ca…

MALICIOUS

PDF

75.6 KB Created: 2021-07-15 22:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 38d50d9d74594e64391c46ca76b3cb48 SHA-1: f4bd20c034885fdef1ca2438dcc47eed0c680823 SHA-256: 8ca5e78c3804f7ca964eb35c9888b6cae93b685674f0931d3c3fc5f52d357666
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious content or download a secondary payload. The PDF structure itself is suspicious, with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7788

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/~3/4Ji06Fp1PxY/square?utm_term=beetroot+minecraft+soup
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed8c39c2b47a6141a4bc78/1626180665890/rovapegigafo.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e87506bf40f76e12ea5147/1625847046758/pass_on_synonym.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f042a90511021e70b90f7a/1626358441203/near_by_hostels_for_ladies.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_off0000c798.bin
e103a4482864222d8024d3dac4587283812cbf780f4549c892be17c7a77bfc67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC798 10748 bytes
font_01_sfnt_off0000e056.bin
7e1c34ef90b5da160e0ecfc5d38b6e7ba0498d8f16c2cfd3990a88aa894d9227		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 16388 bytes
font_02_sfnt_off00010aa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 16792 bytes

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