Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79b89bfd4684330…

MALICIOUS

PDF

72.4 KB Created: 2020-12-23 22:04:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 12bbe0d65eae4407c3efbd4dc9a534a3 SHA-1: 9ba65ac175cf1b4a32b0c580f921644c5f54eed4 SHA-256: b79b89bfd46843308154b35ea9ccd35683d60353473d4886cfc37a382838c2b7
104 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious URL, likely intended to trick the user into downloading a secondary payload. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?utm_term=candy+crush+jelly+saga+level+407 PDF link annotation
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/nibakemiwa.pdfIn PDF document text
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/vovetiba_riwenuvaluga_vilozokobat_timepimevopawus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/widiku/aparato_reproductor_femenino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9480fde-b9b7-485d-a282-1ef3bf50d448/2531981777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0e2fce-056f-42f0-84cb-573ca9c7264d/59086035947.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/blast_furnace_guide_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/bambukat_audio_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a49dd84d-107a-4d4b-b872-9453ff313a47/61498383584.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/spongiform_encephalopathy_def.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/third_trimester_checklist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f01ea38-d676-4c41-911d-bf9c3cb35ad9/3880189405.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/stick_rpg_unblocked_77.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8456eee1-3a97-4b14-9ae9-0d192586c7eb/wow_classic_the_angry_scytheclaws.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 5416 bytes
SHA-256: 09f47174b7df597d71774e02905241c6def5f55dd87fabbd8ab1b4e96d81edfd
font_01_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 10764 bytes
SHA-256: 11dc069b5553c0dd07899aeffafc0861c7450f143b8d3625124910d6e6a9faf2
font_02_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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