Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9936b42147f099d…

MALICIOUS

PDF

72.4 KB Created: 2021-02-22 06:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 68396bb435783103a360e22fcca584eb SHA-1: ec6d84441c41d755ef46c71f69c2282b50e20777 SHA-256: d9936b42147f099dc68c85e2b9974bd4bd9c89279f4bc114c6b32643fad0abde
184 Risk Score

Malware Insights

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

The sample is a PDF document that contains a link to a known malicious redirector, yafferge.ru, which is disguised as troubleshooting information for a Cuisinart coffee maker. This indicates a phishing or scam attempt. The PDF also functions as a link farm, directing users to numerous other domains, some of which are hosted on disposable infrastructure. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful websites.

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
  • 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 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.
  • 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://yafferge.ru/strik?utm_term=cuisinart+14+cup+coffee+maker+troubleshooting In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418362/normal_5fd3b9571ef2b.pdfIn PDF document text
    • http://pollsexpert.com/8650626727395qji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_601bfd58e0f0b.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/jheTicc/wexiwijoguvesubijepunax.pdfIn PDF document text
    • http://ru-en.xyz/321680083129pgdp.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/enghhhh/86267318226.pdfIn PDF document text
    • http://trysoda.pro/80321453528tcmai.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368742/normal_5ff3a0ba184b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403404/normal_5fe12016b642b.pdfIn PDF document text
    • http://wilitubejibo.iblogger.org/serials_of_sab_tv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fcff551ed6d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fc9dd7613d8a.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/negonanopix/72050120220.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/70393697191.pdfIn PDF document text
    • http://maboduxivugiv.rf.gd/night_figurative_language_worksheet_key_34-_45.pdfIn PDF document text
    • http://pigozezidum.rf.gd/define_brittle_deformation.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/vefilugagatidozesone.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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 5676 bytes
SHA-256: af56be4e847845576e52290fad49894bbf93cfdb25703abd420548d1e0bccbb9
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 10928 bytes
SHA-256: 832a9367494f2f58c6505eed103a06336ca04368f464cba85a101c1ad483f76e

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