Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cea91878ce1cae…

MALICIOUS

PDF

80.4 KB Created: 2021-03-17 13:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 1d0ff3c6b270ea259e8f0245e2ddfe86 SHA-1: 5105fc05c159d43959ef841b8f94ad199315fe5b SHA-256: 37cea91878ce1cae79e59320f72aa2b30232ac5d668019dceff9089a6ccf8a47
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. The presence of an external URI pointing to 'pelibifir.ru' further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' indicates a malicious intent, likely related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=sunshine+adagio+in+d+minor+pdf PDF link annotation
    • http://shopwithsale.website/kenmore_model_148_sewing_machine_manualwlu7g.pdfIn PDF document text
    • http://blacklaser.ru/tobitexavijuwaxikufadeh414h.pdfIn PDF document text
    • http://menawamuno.iblogger.org/confidentiality_agreement_template_for_counseling.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://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_d36c944b86b4417ba78d395016126e04.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_8e42901f575a4f7aa7525fee2ed7b9f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuxime/administrative_assistant_procedure_manual_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/76815656098.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/18395829627.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/72358442423.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/fractions_to_decimals_free_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/ardougne_easy_diary_guide_osrs.pdfIn PDF document text
    • http://nosaras.rf.gd/wonesa.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_1f14faee91df43c4ba109ece045e7653.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/befunky_photo_editor_pro_apk_online.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/56611054804.pdfIn PDF document text
    • http://gelutusuxipedib.rf.gd/sustainability_merit_badge_workbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/sigafuxitolatukinu.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_ced6a218b49a452181cc24892cc1fcc8.pdf?index=trueIn PDF document text
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_c270a999965f4bed926732aca46a59f5.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_62f0c411632c4273b0f8557aafdfdc32.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_96fb0041e4444ebf81f328c4d6e01222.pdf?index=trueIn 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_off0000ee24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 5328 bytes
SHA-256: 288fb7ac7a34bce8e9d45a4426463b2235f28a837174c3280cee06b29a29e84f
font_01_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 11276 bytes
SHA-256: 228bb56cdb5239c6b0e5caaa02b71d8ba8f9cee753b314a488ed164007077660
font_02_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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