Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82eb548c441ad15…

MALICIOUS

PDF

81.2 KB Created: 2021-07-12 23:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8476be5ae34da3e45a5f1a11a51ebf58 SHA-1: 47d79f899f41120bfd9c8cfa3a327b8f34b10f41 SHA-256: f82eb548c441ad15f15ffc1ec3ec6d99315420d886a7535eecd3cfa5a541bd71
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-like behavior. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings point towards a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8287

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/~3/7R6buoffwiA/square?utm_term=texas+motorcycle+license+requirements
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e767914fae2d22fbfe155d/1625778065463/44201376949.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec92147d354a5e86a41832/1626116628710/36996745829.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e78cd795719b356d8e42c4/1625787607345/watch_online_bollywood_movies_sites.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e935b5b68d8f0f4bf8ef60/1625896373730/newly_made_proteins_are_modified_in_which_organelle.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec792a154eb17b6848eef0/1626110250183/use_rewrite_in_a_sentence.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e9152366be7e490f0f1f1b/1625888036154/1800_seconds_to_minutes.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_off0000d86e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16792 bytes
font_01_sfnt_off0000f085.bin
3b40fa966a3036331a6bfb53a9be6f97dfdf97fc2f28ed5407c4bbc7a5a034d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 10816 bytes
font_02_sfnt_off00010986.bin
0f50c4a471877c4161c83add7402eb58818cc24fe7d573c5feffcf78428f9ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 17300 bytes

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