Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef209b745eb5afb2…

MALICIOUS

PDF

67.6 KB Created: 2021-02-06 07:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 7c129eb506a9a3bc17ff0e83b0d1fa33 SHA-1: 5cb250291bb264d8f56b603417770c716f51f1a2 SHA-256: ef209b745eb5afb2bf1bb85667942b3e03ae671c34102930c5c0b9afed9a930f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7771

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/aws?utm_term=dark+black+background PDF link annotation
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/8702912.pdfIn PDF document text
    • http://bioforcecolumbia.site/devowotitolmsohu.pdfIn PDF document text
    • http://insta-sale.site/8198357848710mfb.pdfIn PDF document text
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/kaxejuwadofi.pdfIn PDF document text
    • https://kagoxikefo.weebly.com/uploads/1/3/4/6/134649289/xabufesewid_pawitavo_zoweg_jikifutunop.pdfIn PDF document text
    • https://pajejasebuwosiw.weebly.com/uploads/1/3/0/8/130813778/ganajil.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/2831616.pdfIn PDF document text
    • http://shoop-ft.ru/lumojixovosifub5sidb.pdfIn PDF document text
    • http://superheatbelt.xyz/ragonoxurewilitawqv7d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/telasebisu/alarielle_mortal_empires_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/8016855148.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/wifi_calling_on_android_verizon.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/printable_2020_blank_calendar_templates_calendarlabs.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/jawezemefe.pdfIn PDF document text
    • http://xujalupa.epizy.com/bukuvamunemirabof.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/50262414708.pdfIn PDF document text
    • http://rituruve.epizy.com/microeconomics_chapter_1_questions_and_answers.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF4 4768 bytes
SHA-256: d089ca4ed3f8f3b1d7c3648c78765d8df28432539980c63de94665bb7fd0bcc7
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 10736 bytes
SHA-256: bc01f2d1735f6b5bb4d3faf79d80ccb58b0a352db78cc97641969349cefefb9c