Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e91bea5ffd5cadb…

MALICIOUS

PDF

76.2 KB Created: 2021-03-16 08:12:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f11a06c611a3075433ae61a016dedfd7 SHA-1: b42b60a3bd0c3dccfa03fabd29eaf95b38730d5b SHA-256: 4e91bea5ffd5cadb5e841e303d9655906611ce133a8ff23e7b299d9c13895934
184 Risk Score
Tags
free-cdn-ebook-manual-lure

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, likely for phishing or malware distribution. Although no scripts were extracted, the presence of numerous links to potentially malicious domains suggests a tactic of directing users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=ophthalmic+assistant+book+pdf In PDF document text
    • http://strahauto.website/265061204713vm1.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/Hqv2Fgg/80698401295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_6048222c844a3.pdfIn PDF document text
    • http://pushbiz.fun/signos_que_se_atraen_en_el_amoreee1g.pdfIn PDF document text
    • http://serdyukov.pro/vozizedanu7kj2.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/jajg5AY/amarok_comfortline_2019_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_6021fb3a2081f.pdfIn PDF document text
    • http://moviesaddaa.online/289584262376f35k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471252/normal_6018e76a3f988.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/wcgi47D/call_directory_pakistan.pdfIn PDF document text
    • http://fabermanufacture.ru/ultimate_broadway_fake_book_piano_shj7kvr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_6046e24153768.pdfIn PDF document text
    • https://cdn.sqhk.co/rewazexi/1hgchfU/4947404301.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/goneduzum/meror.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/call_of_duty_apk_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40181bfd-969f-4713-9661-794f41193ccd/logic_puzzle_books_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48611939-40ad-4117-9739-6d12fc61d7fd/79135205318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0111dfed-5a5b-4ccb-8808-6240ce4b2290/how_long_do_dyson_air_filters_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fa371a-b392-42aa-b434-8b91c284b0f8/95768548414.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/34251866855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a2e25f1-b82d-41e1-8493-33a34e26e8d2/fidufevaxiriv.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_off0000ed79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED79 5528 bytes
SHA-256: 50913b4ca4f585b0a7687ac725450bc12a9566380f37c9326616936b46e9fc69
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 10492 bytes
SHA-256: b912ecdd6e84e7cc95a0a4d7cc96342dfdef9d3ea3308daa34462e472aab98e6

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