Malicious PDF — malware analysis report

Static analysis result for SHA-256 536af7f30902f431…

MALICIOUS

PDF

89.4 KB Created: 2021-03-23 17:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 036b80650fe1901c9fc45bee7c13972d SHA-1: 1f8c37b9d2a91cc6a2d9d7a75c4974305a283ddc SHA-256: 536af7f30902f431f9f64764c165d139beff83c7e2a477cd778d7544fd3e0ee0
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The document body, though partially corrupted, suggests a technical topic ('how to edit grub.conf') to entice users. Several embedded URLs point to potentially malicious PDF files, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 http://huaweistoreukr.xyz/22904362309l80eb.pdf In PDF document text
    • http://laulu-go.ru/how_to_make_a_starter_base_in_dayzczmru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374359/normal_5fcef76d5277d.pdfIn PDF document text
    • http://dk-inc.xyz/brihadaranyaka_upanishad_sanskrit_englishbyaeq.pdfIn PDF document text
    • http://btsworld.org/real_car_parking_2_driving_school_mod_apkz7yx8.pdfIn PDF document text
    • http://busforpay.online/tudifaw9m4t8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489740/normal_604474544c0f0.pdfIn PDF document text
    • http://nickned.me/katafiqu55i.pdfIn PDF document text
    • http://winoorama.site/tugigoxesdc5r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=how%20to%20edit%20grub.conf%20in%20rescue%20modePDF link annotation
    • https://s3.amazonaws.com/fejakixoweka/epiphany_piano_sheet_bts.pdfIn PDF document text
    • http://dudameridetira.epizy.com/diwiziga.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/71503041704.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/bezoar_forming_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/58033908945.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/block_specific_websites_chrome_android.pdfIn PDF document text
    • http://runapapaxezupow.rf.gd/avast_cleanup_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/10834672611.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/25499343795.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/52317727544.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/baahubali_picture_video.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/how_to_calculate_pvifa_on_financial_calculator.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_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 5324 bytes
SHA-256: c88b5f3f2abd3a0fb427f8fe2957811e663fd853e6a83480e2e538f7742c23a8
font_01_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 10756 bytes
SHA-256: dc255187e8fc7acccf12c9a3b27e4bc69096f70acea2aa73dc1879830465c38c

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