Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b7cc9535d37abd…

MALICIOUS

PDF

77.8 KB Created: 2021-03-09 09:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dd94729c20415086ae5d1afc9c65ecae SHA-1: 9f13324fd929749d3f31ec9e1b334a1f905c445d SHA-256: 84b7cc9535d37abd0edbc1fa863d3bf0e902d0436e375164de45a127dcd78b28
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be part of a link farm designed to attract search engine traffic. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF's structure suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://pelibifir.ru/award?keyword=pearson+physics+textbook+online+pdf PDF link annotation
    • http://rezotu.xyz/38787891595du42g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465003/normal_60223cd352f04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420924/normal_5fcda092eb00c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428045/normal_5ffca24b48e09.pdfIn PDF document text
    • http://nibelv.xyz/faiths_of_eberron_3.5fl9t0.pdfIn PDF document text
    • http://zumbayuliya.online/kiss_the_rain_lyrics_billie_myersb4kdf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482415/normal_5fced5f819bf3.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/lowolebuzilu15elg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_600c1b01b9006.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/bojafazes/lizamowefosorotebofo.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_6e3cbc52f8a545e58319ac0c8bc4e626.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/rirupomudixejasezugi.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/definition_of_engineering_economics.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/73104184336.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/80023247157.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/56680688817.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/rizarironuvemaguxe.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_15659d9f1afa4df8a2507e4d9810b2f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/latufenaw/rii_mini_i8_manual_espaol.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_dd8304786a0641009c53fcdddd6f7b99.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_fe1467e0be04427b9d31155238d4f129.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/fewogofi.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_off0000f215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 5616 bytes
SHA-256: b03b22edd90a2f6bf3d41f88bb764a3cf4e9bbf0c856ed12ca21116bb073e9bf
font_01_sfnt_off0001052f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052F 10836 bytes
SHA-256: 6c4f22fff964b0f595e3a7223c588ba50e102b9a89b24dc25cbf8993b4712863

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