Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c66e9607842cbe…

MALICIOUS

PDF

66.3 KB Created: 2021-02-18 05:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5a5d479e1dda49de1279a1df51b24c29 SHA-1: 30ff9684e110c855fbab60c326d4c9497964da92 SHA-256: 82c66e9607842cbedc5004d7d209d44c44dab7bd2c22e21dce38a3c83711d011
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' and a large number of embedded links. One of the primary external URIs points to 'https://jacksth.ru/strik', which is suspicious. ClamAV also detected the file as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to school calendars, likely to encourage clicks on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=hillsborough+county+school+calendar+days+off PDF link annotation
    • https://cdn.sqhk.co/mujawiru/h4Lkjc0/gamer_wallpaper_for_bedroom.pdfIn PDF document text
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/316e8e11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_6024ac8884b35.pdfIn PDF document text
    • http://fajutixosisi.22web.org/92493544354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_5fda030b8c69e.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/8771687.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/hkijjfa/wefetejifevinefo.pdfIn PDF document text
    • https://guxiwuwo.weebly.com/uploads/1/3/1/0/131070036/fotep-kulituwazovo-vatelugizaro.pdfIn PDF document text
    • https://xoludebule.weebly.com/uploads/1/3/4/5/134526363/kabokiwoludo-bejulep-guwebewe-gaxikor.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ih3igsb/ar_zombie_shooter_survival.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/gizonukorad/gitefonolurivolaxegu.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/snackbar_error_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/interim_financial_report_template.pdfIn PDF document text
    • http://gesosogo.rf.gd/gebuxupo.pdfIn PDF document text
    • http://pitareri.rf.gd/6212896901.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/95_percent_confidence_interval_google_sheets.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 5484 bytes
SHA-256: d3452cb630c46ed34f0d6e056a44356f2348a45cda27d808800b537106c20b21
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 10052 bytes
SHA-256: d9743055e9d8c87a6e438060ff7125d703feef0acb08e39dc91d9fb0e861279a

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