Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cab2d99a2bac052…

MALICIOUS

PDF

81.5 KB Created: 2021-04-28 00:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: f350c57321a21327ff1f5ec561a05f6e SHA-1: 94c31b5d70f45f49c98b230c1e05e4f41f7c3c4f SHA-256: 3cab2d99a2bac05255c20b16cbe7f29bbe163056dafa9a0848973821b25dd40d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and potential command execution. The embedded URL `https://nipisod.ru/strik?utm_term=arduino+language+reference+italiano` is suspicious and likely leads to a phishing page or malware download. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall indicators point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://nipisod.ru/strik?utm_term=arduino+language+reference+italiano PDF link annotation
    • http://bottlechainworld.com/voter_list_2017_delhiwj4p0.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/VnDgjhf/87403670004.pdfIn PDF document text
    • http://bluetea.space/21019517868wrk5i.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/ghfU5R0/20401974775.pdfIn PDF document text
    • http://3gusevshop.website/sport_of_kings_barber_shop_ellensburg74bc8.pdfIn PDF document text
    • http://yblda.fun/windows_powershell_cookbook_5th_edition7ofxk.pdfIn PDF document text
    • https://cdn.sqhk.co/dokijesu/b2lijhd/36795194076.pdfIn PDF document text
    • http://recepty-dd.info/home_depot_bookshelf_pegsc9kg1.pdfIn PDF document text
    • https://cdn.sqhk.co/weruvewo/Bziadii/certificado_medico_escolar_sep_2019.pdfIn PDF document text
    • https://uploads.strIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/kukigesumarinig.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/suterexilu.pdfIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/barnett_vortex_hunter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a2b16f-6f4a-4996-8af7-ce2ab95d6d8e/lirajuwuwadotapunaxifafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27a4280a-f5a3-416e-a8dc-76ceac47597c/dalodagejexorosopotut.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/14918702893.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/12576346528.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/78890911256.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/number_theory_geometry_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/why_are_my_wireless_headphones_not_pairing.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/dermestid_beetle_enclosure_for_elk.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/92563157588.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/leadership_soft_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/is_the_stock_market_a_bubble_right_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2161ab07-28fe-4991-ad27-96d9c90b004e/53998489399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e0aa76-a835-4dff-84e4-d393a38666d3/gizagorefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0646ae5-4da7-40ce-9458-ae1df1eeca7e/what_is_the_difference_between_grand_piano_and_upright_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/veloj.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_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 5000 bytes
SHA-256: bc6f1c31d0c846920d9952e75ebf1da0b6999cc8b895edc4c60e745252dee88a
font_01_sfnt_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 11064 bytes
SHA-256: 94920310eecae5e1cf95001a6fee040cbba4c25d9733e6980bf6d0e031b18218