Malicious PDF — malware analysis report

Static analysis result for SHA-256 84989a688e375be2…

MALICIOUS

PDF

79.5 KB Created: 2021-03-17 18:53:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5df5c7bcd2ef5e9562a95784340d8acc SHA-1: 2330fd30e6fe659b235f942a40b53cfc57c599a6 SHA-256: 84989a688e375be2328c4a1999e14b18c4bc5b545ad341db4ae6635f838c7d16
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=afasia+global+pdf PDF link annotation
    • http://alisaborodaenko.design/75150111729pgnue.pdfIn PDF document text
    • http://kukushka.space/bikalafipokamah7uer.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/gedijedixobovikevokoxiseg86o1.pdfIn PDF document text
    • http://hookup682.site/capture_the_flag_game_setvssuw.pdfIn PDF document text
    • https://lupilizeranal.weebly.com/uploads/1/3/4/4/134460298/bokisotevufa_gobimibis.pdfIn PDF document text
    • https://memelixuluxowi.weebly.com/uploads/1/3/5/9/135958522/sidaposipe.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/8084883.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/xijilesuzuxo/agenda_2063_french.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/duxukaruzijovifawugonet.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/javascript_zip_file_blob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535ed6bc-1054-48db-b7f5-e56c997542a1/57911097577.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_4d33e9b6bd52445887467ede5e321f5d.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_4b09d73724e449e18628ad81f4ba20c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejideba/59050930339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11fb1fba-4c07-428b-8414-6c591c470e5d/52687484431.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/cambridge_igcse_english_past_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/solutions_manual_for_the_finite_element_method_using_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/how_to_calculate_mental_age_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/it_will_all_be_fine_meme.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_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 5244 bytes
SHA-256: 6019d7f15636b2f7e670cbc771528804e6012e90198ecf306c2f9106ed06be63
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 10916 bytes
SHA-256: fdb16b2d260cf0e7acb848da5f729c0f8466a40c1ab22f1db08f3ba89b611355

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