Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be588fc37422032…

MALICIOUS

PDF

116.5 KB Created: 2021-05-09 13:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a24bda84c444b98f64a5dbf1bcb785a0 SHA-1: b120e6e0f55339a7f7d9027012648b7cc47ae411 SHA-256: 1be588fc374220324bbb14b99818acb0fc6d7a97f4d104743d9cb643b627ae68
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's purpose is to host many links on disposable domains. No scripts were extracted, but the presence of numerous external URIs is a strong indicator of malicious activity.

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://dugedepap.ru/strik?utm_term=el+hombre+mas+rico+de+babilonia+resumen+capitulos PDF link annotation
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/tamaji.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/fejabiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_6011579d36dcf.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/UiihhIZ/7590197898.pdfIn PDF document text
    • http://phulop.store/55026361991n3y0q.pdfIn PDF document text
    • https://bopilewe.weebly.com/uploads/1/3/4/5/134523270/6775356.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/92418218533.pdfIn PDF document text
    • http://afracheat2.xyz/vuviwasalezatilulixux5wmp7.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/agfijha/for_the_following_vector_addition_diagrams.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/che8jid/93508584361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401714/normal_604e26cd98f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409122/normal_60387fc075df2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_6028e2ee7d4ab.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/g9wqrZc/podcast_addict_stop_autoplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fe0453-700f-4240-8691-293bf2e8cd4e/strategies_for_technical_communication_in_the_workplace_4th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06dfc98-4d5e-4bbf-83da-493272376a38/star_wars_the_old_republic_online_player_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79517843-3959-4dda-bb53-e1f488f70330/sakupe.pdfIn PDF document text
    • http://tidizovebimike.epizy.com/vunulezalakan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e063c1f-92c3-4dc8-8485-afd12cf4e076/anet_a8_upgrade_board.pdfIn PDF document text
    • http://nujipuluz.epizy.com/las_asignaturas_en_ingles_ejercicios.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_off00018790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18790 5412 bytes
SHA-256: 4c825fb6b5b2ecbaef8ca9cdd0cce15cdb4f44c791f8f883e0477a3c941cabe1
font_01_sfnt_off000199bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199BD 12464 bytes
SHA-256: 019315bae87f4d85105fd0331a6b12b4c794b40130e765bb451e21b26bb94825

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