Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1b83f7b1f49103…

MALICIOUS

PDF

74.0 KB Created: 2020-12-31 10:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b23fd869cd00d6cad641abe74be5bb5b SHA-1: 1720061d01e383c855dca52605af4978b5dc67bf SHA-256: ba1b83f7b1f49103509a7be97e57cd45f2d2d580d23ad8b1f459df5e4cb148dd
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by both heuristics and ClamAV as malicious. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain text related to 'Truck icon free vector', suggesting a lure to trick users into visiting the malicious URL for a supposed free download.

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://trafffi.ru/strik?utm_term=truck+icon+free+vector PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406168/normal_5fa760b2c4354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453118/normal_5faf6c15d65b8.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/zirojopemup/google_analytics_tutorial_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68b67fe4-4a27-408d-b595-9a219560b1ec/descargar_sony_vegas_pro_13_gratis_en_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a3f16b-11ca-46eb-9286-811e2e1b491e/dreamer_designs_free_diamond_painting.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/blank_half_volleyball_court_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/breast_cancer_treatment_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/tarudulavasixewazetepuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc6dda04-db5e-4994-a3ba-1b7314d39c50/music_theory_for_beginners_piano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f107416-7945-4c47-a13c-42a9d8214dcf/127899897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e8e234-1c09-4089-bd04-1c5877e01d12/vuvivaramagigamirurilusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b12970-d42d-499f-a60b-b28b1dedb3a7/words_that_start_with_an_s_and_end_in_a_y.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/xemumegutibawem.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_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 4528 bytes
SHA-256: 55d3a6b30023c588d845f28c47bf180d789c38a689c34eca1b3ecddd71bbf2f2
font_01_sfnt_off0000f6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BC 10656 bytes
SHA-256: 7b64e7facb8297a6081897bf32354cac741eff9953b090a3c1ad7b29a72cfb7a

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