Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5c559ebeab8f10…

MALICIOUS

PDF

71.6 KB Created: 2021-02-27 16:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 45932e22dbd48273faece4c17ca5fd50 SHA-1: aff9594a2038d12d9ca788f9d9f6da3d7688d358 SHA-256: 8a5c559ebeab8f10e7796a0c1942cd29ec6b43b4776f15e6d4a6a8a41514094a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://gimoguvi.ru/123?utm_term=what+is+object+oriented+programming+javatpoint PDF link annotation
    • http://shoop-fk.ru/kesaze4023r.pdfIn PDF document text
    • http://wodasewusinoda.22web.org/badupodipinonoz.pdfIn PDF document text
    • http://neyroskakalka.site/bimidopobudosiq3ys.pdfIn PDF document text
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/juzonel_vamimiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fda1af0c03a5.pdfIn PDF document text
    • http://temppicture.xyz/daravabekivis6xrjm.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/22f8f.pdfIn PDF document text
    • http://moresukko.ru/the_great_acting_teachers_and_theirjqmlf.pdfIn PDF document text
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/kuzuvozulotevariv.pdfIn PDF document text
    • http://sijetop.22web.org/irregular_preterite_verbs_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446496/normal_601b61785c258.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_6018c83c05a8d.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/vefaxekibavesul-dekizelaj.pdfIn PDF document text
    • http://like-store.site/pdf_tkb_guru_agama_islamt0k2l.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/rutufokedizon/games_coming_2020_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/transformers_movies_autobots.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/58184906188.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_off0000d9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A2 5744 bytes
SHA-256: 9a3a576fb0ecad5182dae2689d3d1ef160e15bed9900a171440a946c1741280f
font_01_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 10616 bytes
SHA-256: 2696b1a0f7ab1764c086b105ae9728d6e4f75575c17da52f84ab3ebc07f4d143

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