Malicious PDF — malware analysis report

Static analysis result for SHA-256 821b6ca3569cb1f9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 10:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 102aad810653538093a4a742a24e35a5 SHA-1: bb4bd9d78ea0fe6ec897a45a5c940826d6627eba SHA-256: 821b6ca3569cb1f9d7635b3486a6f359fc778a92e61c461ff6247a33b2101404
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains multiple embedded URLs, one of which, 'https://pelibifir.ru/wix?keyword=driving+for+life+answers+nko', is directly associated with a heuristic firing indicating an external URI. The presence of these URLs suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/wix?keyword=driving+for+life+answers+nko
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/dbada1d11aee4ec.pdf
    • http://redtea.space/acrobat_reader_dc_professional_freef6m40.pdf
    • https://cdn-cms.f-static.net/uploads/4387811/normal_6032da969e609.pdf
    • https://cdn-cms.f-static.net/uploads/4480753/normal_60547569b72e8.pdf
    • http://microdigitalmeter.xyz/1984_ebook_freewrzry.pdf
    • http://datiwufirul.medianewsonline.com/33597163281.pdf
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/toluwawisas.pdf
    • http://leludezoz.scienceontheweb.net/97090149607.pdf
    • http://minosijasif.mypressonline.com/fonamokelavo.pdf
    • https://cdn-cms.f-static.net/uploads/4482020/normal_604e37fc582c4.pdf
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5ff9b7897b45d.pdf
    • http://ig-copyrightviolation.com/lowrance_elite_7_ti_software_updateswemjd.pdf
    • https://fazijexin.weebly.com/uploads/1/3/2/7/132741066/2763748.pdf
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/xudolenibuj.pdf
    • https://cdn-cms.f-static.net/uploads/4409606/normal_601f8f8d12f3e.pdf
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/5498552.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/65db26d9-58d4-431e-8309-c9164ef84b96/18953635717.pdf
    • https://uploads.strikinglycdn.com/files/6a0f3ca5-0c1e-4fa8-8c2b-7b436f7499e6/dadezulejimawasedubo.pdf
    • http://vejegaba.atwebpages.com/geometric_optics_worksheet.pdf
    • https://s3.amazonaws.com/mesixadelomomo/how_to_tie_an_adjustable_knot_for_bracelet.pdf
    • https://s3.amazonaws.com/xifabilejilab/60582276432.pdf
    • https://s3.amazonaws.com/xofalepelala/51800119246.pdf
    • https://s3.amazonaws.com/takateg/51732523354.pdf
    • https://s3.amazonaws.com/petubapizo/resuremopiwuw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed22.bin
8d47474ec88175c8392e6f82ee04f1e1314404fec6beade2bfe992a4b8cf6156		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 5148 bytes
font_01_sfnt_off0000fedb.bin
e29458ea0aecdb957661f617429f6c53d2aa570b0232e00bcb1b25fbd34b2028		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDB 10776 bytes

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