Malicious PDF — malware analysis report

Static analysis result for SHA-256 36fbfa7741631b1d…

MALICIOUS

PDF

76.6 KB Created: 2020-12-30 04:58:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 20ba862dbd1b2ae74c99c896ee6b3795 SHA-1: 9be638cdb7c89530479ce48f3dfa88daa935565d SHA-256: 36fbfa7741631b1df9313e098174bb9dca32a040c98e7d8bf3e1bddf2ddf3adb
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links to external PDF files, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a malicious intent to redirect users to harmful content. The presence of numerous PDF links and a redirector URL points towards an attempt to manipulate search engine rankings or distribute malware disguised as legitimate files.

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
  • 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://traffmen.ru/strik?utm_term=download+curvy+punch+3d+mod+apk In PDF document text
    • https://nenojidadexodu.weebly.com/uploads/1/3/4/3/134351563/nuzifejazoxisep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_5f9f9c099140b.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/dibJEjd/photoshop_sharpen_image_high_pass_filter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fc6cc6ba054e.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/niaOibl/nererapadolebadido.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/hfeYdhs/mlb_playoff_schedule_houston_astros.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/hbgfihd/likert_scale_template_1-_5.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/4XQgjj8/golowopikiramenoleweka.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/iciigeG/juwipikogetajur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f874b6575caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fbb1cae7a5db.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/nuvazul.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/210d41fb-2cb4-49c5-8761-ddb731e7e4b3/temixurukisurazetuzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d8403e-de9a-47de-b47b-70d18cfe2e28/11_zip.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_off0000eb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB19 5616 bytes
SHA-256: bc3cff9f8c740606c889f7fb058ba21fd2683da3b68017d93150f3abcabe96c7
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 11004 bytes
SHA-256: 1626415a1f7d3ea30c74855d0b7f94fafe43765d8ec7f1b81d65c4d336e4030b

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