Malicious PDF — malware analysis report

Static analysis result for SHA-256 628571998dc0a873…

MALICIOUS

PDF

80.4 KB Created: 2021-05-23 06:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 074b43530940140147ca02523ad1f851 SHA-1: 4167bb0fe4206b78f7eb91c095e2e334edbc08f1 SHA-256: 628571998dc0a8736ee639b012eb91b177c45437770ab56d1a55cb984fc46067
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The primary malicious URL, https://mezovuduw.ru/strik, is presented under the guise of a calculator reset guide, a common lure for credential harvesting or malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=how+to+reset+casio+calculator+fx-300es+plus PDF link annotation
    • https://xulazipilo.weebly.com/uploads/1/3/5/9/135958699/zodepa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_6005e51b3208c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462354/normal_5fe310bcb7753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_601873c9578e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fcd1f21cc0e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391642/normal_604941fa19856.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/2509867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_605b9a73a38a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491451/normal_5fdd99341ddab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_60146758850b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416923/normal_60290d81281e3.pdfIn PDF document text
    • https://batabokisusixil.weebly.com/uploads/1/3/4/6/134689132/c787ca115.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d08497e-fcd6-4f39-8c43-8e32cc57a146/norton_shakespeare_comedies.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/29828784410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b9f5e4-c227-42b3-9d5d-c8a1b1383210/30465539236.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/korean_made_simple_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/32380842741.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/xewumewonobex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11581fb1-7d1c-4ccc-8ba8-a84dea9cb756/how_to_make_a_pie_chart_in_illustrator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbbf1b0-6089-4db4-9ef2-4b34ddbc5e36/vexid.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/how_to_put_sonos_into_pairing_mode.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/the_selection_elite_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fee7a1-751d-4d10-afea-4591cc00147f/41843337743.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_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 5468 bytes
SHA-256: 9c166dc1d359fa5ca5d3ec6170a06f76367e40c7ce43551dbb5e8df31ed26e7d
font_01_sfnt_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 12536 bytes
SHA-256: 2b3d277a7124d1ebfa1535e01949a771a7ad70bd89d75178ac8f6521394bceb7

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