Malicious PDF — malware analysis report

Static analysis result for SHA-256 7150b0e15cbfc3df…

MALICIOUS

PDF

91.8 KB Created: 2021-03-15 07:39:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3d60d84f0b4e0513a0964acae18ba2d7 SHA-1: 434b52e0ab773e5256aad102c1663f39d59a94c8 SHA-256: 7150b0e15cbfc3df054da9aee8633b70c2c90be53d3a7693caa035ea3e2d3ccc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in phishing or to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, aiming to trick users into clicking on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/wix?keyword=photosynthesis+virtual+lab+worksheet+answer+key PDF link annotation
    • http://ravigimojamel.mypressonline.com/geography_of_ancient_greece_map_skills_worksheet.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/mean_median_mode_formula_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_601f33f631e17.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/78181140998.pdfIn PDF document text
    • https://cdn.sqhk.co/wubukuxivupe/hdvirjj/bounce_news_app.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/viwav.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/cd8XjiH/critical_ops_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/piwewupovo/cKifhas/cset_english_study_guide.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/68488514215.pdfIn PDF document text
    • https://fafiwopadatomag.weebly.com/uploads/1/3/5/3/135326984/zonufo-sexavametazoteb-jowilujeru-xikejot.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/qiaiaKh/pewowemesudedogid.pdfIn PDF document text
    • http://gikepofazanapol.mypressonline.com/25588366824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_60370cec68bf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fe1a1a86374e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_6011045148a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528876/normal_602ebcaba60e3.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/pusori/vulunomozaveli.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/figurative_language_dalam_puisi_the_road_not_taken.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/rheem_hot_water_heater_complaints.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/podux.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/dajozufajexukegemifo.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/36875037340.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/83831363805.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_off000126b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B4 5232 bytes
SHA-256: eb0b93e601f0fda4dcf0b7f9e449b0c255e037432fc3532e5749651a4a2648ac
font_01_sfnt_off00013894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13894 11892 bytes
SHA-256: 50b669415fab358678ef0c3acc37a9a86e73092bf2445b61290e9de0df2f5860

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