Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f448729c0a654ff…

MALICIOUS

PDF

79.5 KB Created: 2021-07-14 07:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 55156fa7cb038b985968cd6d9a2e33eb SHA-1: 5ca95ed43608cdfab35de32fb9d2a33ce3cc4a27 SHA-256: 6f448729c0a654ff095d55c375cd19b0a12c23b79a7b67abc662c0ea84bb1438
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The embedded URL, disguised as a service tool download, is the primary mechanism for luring the user. While no scripts were directly extracted, the PDF structure and the nature of the embedded URL suggest an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8439

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/jEScUJLm1bs/square?utm_term=service+tool+v3400+free+download+mp+237
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7e86d6e46386ca3c12303/1625811053118/fejijuvazepiv.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e4fce6bd1231e604af0d/1625875708401/83876876468.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed8d6bfb5306426ed08a42/1626180971378/comprehensive_pharmacy_review.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7c703a853d606aebb7df/1626111089043/if_the_world_was_ending_lyrics_jp_saxe.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec93fcc32416487af0cfb6/1626117116785/sidiretubanef.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_off0000d3a8.bin
c091825c1d73cd71180cd1850b9ff79dbbddfa64cb8c2260c02a5de7333bdfc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 11380 bytes
font_01_sfnt_off0000eeae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 16792 bytes
font_02_sfnt_off000106c0.bin
36223282632a4790be6c9a07a0427b985ad0593131c23546fa711c954b569a52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16736 bytes

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