Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ff5642a7802ec85…

MALICIOUS

PDF

73.6 KB Created: 2021-02-22 22:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01550d46a4bbdcb9b30e77c5af218b27 SHA-1: 826fc17984669f90d98e1b165b4dbf7585e8cd32 SHA-256: 1ff5642a7802ec857093d89bd902d4134f018dcf1b3c7a1634afad52efad054f
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are typical of lures designed to trick users into downloading further malicious content.

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 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/wix?keyword=tv+guide+christmas+eve+2018 In PDF document text
    • http://pristav.pro/allied_telesis_at-x930-28gstx_manualjhsco.pdfIn PDF document text
    • http://foyou.store/84037289003vkzmr.pdfIn PDF document text
    • https://cdn.sqhk.co/fizuborugas/haD4oih/jipolomorurubelik.pdfIn PDF document text
    • http://idem-peshkom.ru/data_structures_and_algorithms_in_swiftvpa1w.pdfIn PDF document text
    • http://voicebftyi.com/graph_theory_handwritten_notesv1nbj.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/jhgjgeu/dictator_2._0_skis_2019.pdfIn PDF document text
    • http://vivadoctor.ru/tebifunobivojuzun2vd2m.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/YCLdKyn/lightseekers_physical_cards.pdfIn PDF document text
    • http://my-favshopc.online/guidewire_testing_training_in_hyderabadheu61.pdfIn PDF document text
    • http://myshoes.moscow/831816241679dd4y.pdfIn PDF document text
    • http://blaugrana.ru/mavejunidedixedaus735.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jarawujutuva.epizy.com/piano_adventures_lesson_and_theory_book_-_level_1_book_only.pdfIn PDF document text
    • http://rifoxofome.rf.gd/diabetes_canada_guidelines_medications.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/6036214971.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/2531631094.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/catch_platform_images.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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 5848 bytes
SHA-256: 650cb5b371b31c6127651d8e807fb164cd81f145bf47f7616bff88723e89e11f
font_01_sfnt_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 10392 bytes
SHA-256: 928f85a59bf6c9a4737515413a0cfb646bb372930e916f073e49b8a6c1e61b00

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