Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8449fa4a3441a4…

MALICIOUS

PDF

71.3 KB Created: 2020-11-18 08:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 94cf72b4f0c503c8d41ee992a98e55c2 SHA-1: 51b36e8645488fff85f6ec0e4310c2cf68451d6a SHA-256: 2b8449fa4a3441a4732a0b076286cc82e55ef772aea3fa2ee27a400e4d28be09
214 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure and a large number of external PDF links, indicating a link farm or phishing attempt. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly suggest a malicious intent to redirect users to harmful sites. The ClamAV detection further confirms its malicious nature, classifying it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=realtek+alc269+driver+windows+7 In PDF document text
    • https://fuloremazugad.weebly.com/uploads/1/3/4/3/134356453/91159588a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5fa169437433d.pdfIn PDF document text
    • https://wovasemuzusalej.weebly.com/uploads/1/3/1/6/131636629/buguwimipowara.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/46819cb8564.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/remosuz-xapinis.pdfIn PDF document text
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/dufezo.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/sugaguxagu/already_yet_just_since_for_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/automatic_call_recorder_pro_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/minecraft_scarecrow_skin.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/attunity_replicate_6._0_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/northwood_high_school_football_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eed0147-6e2d-4356-a3ca-70bbea6985c7/players_handbook_dnd_4e.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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 5676 bytes
SHA-256: b78485a78a35e0fd9d5a4bb0965a0dfcf0c4430e0b4d5cdf0a575a5775c7736c
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 10332 bytes
SHA-256: 6aeb3638140d7a6930c114b4b5e8782b6962782def016dd157c564a9bf55b3f6

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