Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1455d39220b0f95…

MALICIOUS

PDF

72.9 KB Created: 2020-11-09 22:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 85f201fe744246cd4f36177a5bfc36c9 SHA-1: 8720ed9cfa20eee6c2eff573ddc65401036d18ae SHA-256: b1455d39220b0f95be732ad401efc5b8cff0c4b696fc5d38734f53797365562b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic firings indicate the document is designed as a link farm, likely to distribute malware or conduct phishing. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect the user 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?keyword=ninja+foodi+air+fryer+oven+manual In PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/3575545.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/e29b675b-9168-4bac-b11b-2fd4c8caa3cf/20922553929.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/belajar_photoshop_cs3.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/balloon_tower_5_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/survey_of_alternative_fuel_vehicles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140f940f-f133-4699-99c4-cfba35347798/52wx4_sony_radio_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/85779451026.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/changeling_racial_feats_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ad6603f-0bad-4674-be0b-54285355e952/91011674409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bc2a94-cef6-4b68-b3d0-7f1e7799784d/shelby_county_probate_court_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/sutejik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b5fa6d-834c-4b51-915f-653c260786ab/1920299272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c76ffc3-7468-417b-9497-e7ad83d9c6f0/how_much_cinnamon_for_abortion.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/37303660098.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_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 5080 bytes
SHA-256: 00206ff70deed1ed3cb9c93b3878bcfbe2557a0071d27845513b6fc3832e31d9
font_01_sfnt_off0000f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11A 11172 bytes
SHA-256: 8036b7c4954664128850f949d6846e997ac1153a68dcf62f63dcabbe750551c5

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