Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f39778b905c9d50…

MALICIOUS

PDF

68.9 KB Created: 2021-02-25 01:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 83dc52263bfb7ba3d0d7d72299ee2a4e SHA-1: a81d7434f77a29334d23f26d39598f0423e4e97e SHA-256: 1f39778b905c9d50d31de4748c6cbd99a679c2542567a8aa5a419f5df0e2892b
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'baarspo.ru', which is likely used to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://baarspo.ru/wb?keyword=line%206%20150%20watt%20spider%203 PDF link annotation
    • http://goodnaturak.space/wood_joints_in_classical_japanese_architecture_espanolvk5xz.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/cibd6jd/paper_and_moose_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/dediwifime/jrHwhav/mexican_word_of_the_day_russian.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467032/normal_600d4f1e5c8fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373259/normal_5ffc0195012f1.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/eiap3D5/55896247898.pdfIn PDF document text
    • https://cdn.sqhk.co/girasufu/ghOChjb/zexuwanunejef.pdfIn PDF document text
    • http://flash-sar.online/433341631486tdu1.pdfIn PDF document text
    • http://callup.today/circuit_electrique_frigorifique45m30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_602879ad167e4.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/egje8pq/51254641391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fe78c00b1f7b.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/YgchaHf/pakitosojelowuvurunetux.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/RhcX2ji/ludovico_einaudi_divenire_sheet_music.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/wapabefizosumi/java_mobile_god_of_war_game.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/jopugumixogalifeji.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_off0000c4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EB 5268 bytes
SHA-256: 34c5a3525d2b2b2bfc77da4559c315aff36e39d6e7a2f478a2eaf3e8d43fb862
font_01_sfnt_off0000d6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E5 9944 bytes
SHA-256: 51a30556cd38342052a1382f09f17b29d9ed0144bc47ef90d6ebae8cbee1e497
font_02_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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