Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f8a5ba55191c0b…

MALICIOUS

PDF

79.1 KB Created: 2021-07-13 17:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f27ddb9eb9686313fcda61226c658ed SHA-1: 56ac6e38fc1a6b2966d283485376a855423743ba SHA-256: 86f8a5ba55191c0b6019352993b68d8298f3a5121c8ee78da16b69af10b8b8b6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to malicious sites. The obfuscated document body and PDF structure heuristics further support a malicious intent, likely to disguise a phishing lure or a secondary payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8134

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/-7-cX3opz_8/square?utm_term=introduction+to+labview+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec9491b3b63f0898f36a24/1626117265200/79099849514.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec784cf89f8e700bf6519f/1626110028371/fagizimote.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed85e6fb5306426ed00fea/1626179046223/jejavajisivolelijirepoj.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7f63f5c1b8460033fef38/1625814591390/freedom_fighters_online.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79c4ffdc75e32ab03ebf1/1625791567463/88691206860.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_off0000d468.bin
e311ec38fffea0fbb0c41914b77fafa6facdf57f484a0fd4a27d6e5d12f988a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 16056 bytes
font_01_sfnt_off0000fe31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 16792 bytes
font_02_sfnt_off00011648.bin
f650f49b6563812195c014b383f1554a66bf1f905ab0f725e221de576c0959e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 10788 bytes

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