Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3cdf097e4e6f82…

MALICIOUS

PDF

78.5 KB Created: 2021-05-24 01:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0844421480e087be3826b2a3b533774d SHA-1: 29272b064516d7eb9a7d962cd214181f894e971f SHA-256: 6a3cdf097e4e6f827b74e5bfc42743d644612a72a2779b88cb53d49ddaa8c3b1
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to interactive books for babies, serving as a lure to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=livros+interativos+para+bebe+1+ano PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4480579/normal_5fc8d4b3d2f06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_60117e4b97cf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392857/normal_5ff151ca18710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_6052cee71932a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_606c6905953a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387226/normal_5fdf8216055fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374700/normal_5ff86dcd56ee5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416506/normal_5fcf08d74d69b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415930/normal_604f87563ca3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_604e07402cfdb.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/lepefi/nofupajejitone.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/asp.net_mvc_interview_questions_and_answers_for_1_years_experience.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/vazarizube.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/82117791579.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/exercise_bike_weight_loss_results.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/54503744260.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/how_to_do_a_step_10_inventory.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/baroda_pioneer_mutual_fund_redemption_form.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/sibagix.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/89070042255.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/razapofulakeragino.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/rewiwojogewo.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/92641482632.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_off0000e4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BA 4760 bytes
SHA-256: 9b2a10d461da4524735375b771f457a34a54eba51169689b49b769a94a7093ef
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 13652 bytes
SHA-256: 7d0bacb3153b890ce92455258c7464cc48f66cd3fe1870593ae747801855edea
font_02_sfnt_off00011e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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