Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdc64fdd4b14e01…

MALICIOUS

PDF

74.2 KB Created: 2021-04-10 11:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 620f131c38afc3f2713bc4eb58b91ec2 SHA-1: 950f67b8a22b7a1de2a4e79d927942f850a6ace6 SHA-256: 5cdc64fdd4b14e01e61260ca0a7075443a59f658d9071205dfb2e062b51bed9f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to interior design, aiming to trick users into clicking the malicious links.

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://dafemum.ru/strik?utm_term=how+to+learn+basic+interior+design In PDF document text
    • http://bivoxuwod.iblogger.org/78386710267.pdfIn PDF document text
    • https://cdn.sqhk.co/sixatowitur/TjaRRYf/super_mario_brothers_music_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/dapumexader/yjcGidm/xixiduv.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/dibeT2y/unscramble_spanish_word.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/iheiijh/stack_tower_jumping.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/aashto_m_145_91.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/jijeliwetura.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/4Pcjbhi/70316387967.pdfIn PDF document text
    • http://mopowataxix.medianewsonline.com/33818979545.pdfIn PDF document text
    • http://termometr-medikal.site/mitutoyo_manual_cmm_priceejo5i.pdfIn PDF document text
    • http://fafabil.getenjoyment.net/nuwogipuxuvag.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/datarofapakil/kotanul.pdfIn PDF document text
    • http://sesosufavi.epizy.com/33153804958.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/whirlpool_cabrio_washer_and_dryer_installation.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/99507242393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efe5ffb6-a8f8-4e7f-9680-81af245011ba/animal_farm_george_orwell_summary.pdfIn PDF document text
    • http://megigezorozo.atwebpages.com/theory_of_probability_and_random_processes_koralov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90358f0b-962d-4389-99ff-ab6328896ea8/rainforest_jumperoo_seat_removal.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/70446303883.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_off0000e393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 5300 bytes
SHA-256: d386a4bfd52a920f1ee725913da3dd8af9abbd4612d7c34f7e789ae78a22a7b9
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 10880 bytes
SHA-256: 8e4d88ac2f4a49c356b3d40737dc2fea73ec1007b5c47420f23d4e896d1aff23

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