Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f7a677f1d7c942…

MALICIOUS

PDF

75.2 KB Created: 2021-07-14 00:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09e96106a7bb45e9c50ac965325ab581 SHA-1: 88c8f20e8bbc94938926db596d87b99c13ff9f1e SHA-256: 27f7a677f1d7c9425fe9b8b81b4333c98811922a22964e70477fe06eb07aca70
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URL that is presented as a resignation letter due to a family emergency, likely a social engineering tactic to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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/razvivatel/yapz/~3/1LSSs5qy-i4/square?utm_term=resignation+letter+due+to+family+emergency
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edef7be83f616bcf84a4b6/1626206075398/how_to_play_fortnite_on_chromebook.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8f47adefa333328a8943e/1625879675444/meaning_discernment_bible.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed880bf9a98d6db3aeb92d/1626179595459/pcp_meaning_in_medical_terminology.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed9e2ef827c554fd9fcd6e/1626185262643/egg_and_vinegar_experiment.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8069897884458c9a35801/1625818776774/nidanovomo.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed90bfc76d6b0ba00f87ad/1626181824092/30039014244.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_off0000c217.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC217 16792 bytes
font_01_sfnt_off0000da29.bin
895bfc417ff353ebaed62b663defa2ff9b2259653f08986847b9a84b3a868bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 16680 bytes
font_02_sfnt_off0001058d.bin
8a2bd9da3da0833c3859bdd2f31f63fa6163fc8d8f98b76476980d3a547a5b70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 11076 bytes

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