Malicious PDF — malware analysis report

Static analysis result for SHA-256 b189380050a22575…

MALICIOUS

PDF

83.9 KB Created: 2021-01-05 21:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 05500ef257c60204de3bb2884d75fb2d SHA-1: ee375cd9581bf2216b87a332e898957e4c608992 SHA-256: b189380050a22575b4588eaefb79c594b38c4fd040263f66de55d85581ad360e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. The primary malicious URLs identified are trafffe.ru and fiwugepupuladav.weebly.com, suggesting a campaign to redirect users to potentially harmful sites.

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
  • 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://trafffe.ru/aws?utm_term=chorioamnionitis+acog+pdf PDF link annotation
    • https://fiwugepupuladav.weebly.com/uploads/1/3/4/7/134740110/gujixakejaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408589/normal_5fc3b5217b0dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_5fbb06506dffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467273/normal_5fa37d1fbd5d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_5f998ca6e629c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_5fb8d783c0fef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f8c261e1760f.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/posufij/brushed_cotton_sheets_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/muvewubagepujag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd6e55a7-f221-4e2e-9512-17c3fd00e10c/nigiwosugunegufi.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/sports_heads_unblocked.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/8032107207.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_off00010ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD2 5440 bytes
SHA-256: fe8ed9174953dc09b42b2c6e7b108298c592ecffae5567f10957b86fb5f06664
font_01_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 11088 bytes
SHA-256: 3678c8d95ebd0bf33f274dbbf23081492fbb94eb8fb6e7993e55fdb50c533983

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