Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb587b8f90f2ead1…

MALICIOUS

PDF

89.5 KB Created: 2021-07-14 00:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 463f98f8ff1ea1c7d14739e72f93590c SHA-1: 2dbc8ccbe5c6d5af885272c8ffcead2d45fa36bd SHA-256: bb587b8f90f2ead16404bd39dc9b80f44128c09bbd57397a5986a3c8a59c3aea
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI pointing to 'drafthe.ru' suggests a phishing or malware distribution attempt. Although the document body is heavily obfuscated and unreadable, the 'SE_URGENCY_LURE' heuristic indicates the document likely uses time-sensitive language to prompt user action. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9456

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/square?utm_term=easy+cartoon+characters+to+draw
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee008f4c056a31b81edddb/1626210447298/90038446640.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e94bc8b68d8f0f4bf9993d/1625902024263/31819336254.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca6e883836e7a7d641c4e/1626121961034/the_modern_mortician.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8ecec309bd63f3d8392f1/1625877741002/wejasozib.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e798fb97884458c99dc0fe/1625790715749/4017318868.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c137d8d5997ba4e5930e/1625866551122/nugafevipuzedetilo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec86fd5c244202458baff7/1626113789719/1421026405.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e76e910646a909271c62c6/1625779857328/dubegogasizivuvusobaga.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_off0000fc29.bin
c70a96b360b75c177bab4a492c0db23a68b0048f8575c81ca5e9e92c945ecb7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC29 17308 bytes
font_01_sfnt_off000129a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 16792 bytes
font_02_sfnt_off000141bb.bin
02d86f0edbcb74dfcd43bb366657a3de930a6f258a7316198bffdea7d705820d
pdf-font-stream PDF embedded font (sfnt) at offset 0x141BB 10512 bytes