Malicious PDF — malware analysis report

Static analysis result for SHA-256 689920c0e5576f0a…

MALICIOUS

PDF

78.2 KB Created: 2021-01-03 11:32:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 48d36b0603a6875852739af42cae5293 SHA-1: 7bfec86f5492523147d20fffe2d904ab18f095d6 SHA-256: 689920c0e5576f0a577b998292f7ec47bc251e38d82ad43a3b44345ea4e7837e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary external URL, 'https://trafftec.ru/aws?utm_term=princeton+review+cracking+the+act+pdf', suggests a lure related to academic materials. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or SEO poisoning to drive traffic to malicious sites.

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
  • 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://trafftec.ru/aws?utm_term=princeton+review+cracking+the+act+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f882b1831151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fb9786f6c355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5fdc02668325e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5fbf097367c88.pdfIn PDF document text
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/3764594.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f89092fedd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_5fa0baa939aac.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/d1c11f19-f424-42c7-9842-9d3d19130922/maui_hotel_honeymoon_packages.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/70494922205.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/wepasosabomonalutusoxaje.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/xuvedakofixefidezev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2760df-8d82-4edc-a820-f3013f82da6e/cars_hd_wallpapers_for_pc_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/63045194894.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/nepogodejomomufijumex.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_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 5424 bytes
SHA-256: 07eae2b83f6f9848e816d1e08d8a78e0cd4ee46363fe10bc80a591888bae3bea
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 10700 bytes
SHA-256: e2c287d28e4fcca1e90bebd0187ff470ee3635984951477e1d377df3fb01d63c

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