Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc96d264a73229df…

MALICIOUS

PDF

72.5 KB Created: 2021-03-23 05:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b45e3288e74fd7c102bc56792c28aff3 SHA-1: 2cb5cd65e9e0c2f95f4c8e3a8cb850c3951c5744 SHA-256: fc96d264a73229dfbafa8155b37a1f15cf2cdc33f8639cafb0686b476c7d2cee
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. Multiple external URIs are embedded, suggesting an attempt to redirect users to potentially malicious sites. The document body contains garbled text, but the presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jumiwimov.ru/wix?keyword=two+rays+with+the+same+endpoint+are+never+opposite+rays PDF link annotation
    • http://vazawujuzu.sportsontheweb.net/is_paid_paternity_leave_required_by_law.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601535f35b18d.pdfIn PDF document text
    • http://strahauto.website/the_unabomber_manifestoazdwn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453344/normal_60047a9e4dee8.pdfIn PDF document text
    • https://cdn.sqhk.co/fupupusamun/Bb1zibn/word_search_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/ijcPeia/9028041604.pdfIn PDF document text
    • http://jabudapitu.scienceontheweb.net/el_alfabeto_en_ingles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_5fd2dc6a56a3a.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/hbM8DIw/35523641943.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/sesopanuniwi.pdfIn PDF document text
    • https://jedewudozoj.weebly.com/uploads/1/3/0/7/130739070/a349abe422bf.pdfIn PDF document text
    • http://mexicotop3.xyz/97845655126idsll.pdfIn PDF document text
    • https://sidutoxa.weebly.com/uploads/1/3/4/8/134886075/5d1572b2.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/41c5bffd-b1c6-4130-8d39-0f473680b2cf/problem_solution_text_structure_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c06df0-1432-48fe-a79b-5495098d4ed2/50777314470.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/birarokevuvoloxigilize.pdfIn PDF document text
    • http://nununad.myartsonline.com/36347856363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696f5bf8-2c15-473c-9952-0550fb133eb8/jerixowuxakugaz.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_off0000dc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC46 5372 bytes
SHA-256: e6e3fcf4c629fc49689b783304b0b65f123d77382d96ed4cdbd0616475034d7a
font_01_sfnt_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 10616 bytes
SHA-256: 67c62462c1c533794e794143c26196bf9589a2110a92435d6afe8f0512ced687

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