Malicious PDF — malware analysis report

Static analysis result for SHA-256 420fb1f5a22c5579…

MALICIOUS

PDF

68.6 KB Created: 2021-04-05 07:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4694648b4fd3f5bdef32c8e686adec67 SHA-1: 115ef82eb41f1257d66ac5a69569d8d57cdfa093 SHA-256: 420fb1f5a22c5579e5c63519122e21320b0506b38004188626b0ba28319b4a23
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution scheme, likely using a lure related to academic content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=introduction+to+sociology+by+anthony+giddens+pdf PDF link annotation
    • http://pojokup.getenjoyment.net/buying_rural_land_in_texas.pdfIn PDF document text
    • http://zifijovimijita.iblogger.org/59131288378.pdfIn PDF document text
    • http://jakesubinosol.scienceontheweb.net/83828785806.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/building_planning_designing_and_scheduling.pdfIn PDF document text
    • http://jidogirikar.mygamesonline.org/79578259422.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/48589144055.pdfIn PDF document text
    • http://memaberenux.scienceontheweb.net/abrasion_dental_tratamiento.pdfIn PDF document text
    • http://pukutabutosu.22web.org/cessna_parts_price_list.pdfIn PDF document text
    • http://patufulek.22web.org/nipovizomisexuzotubed.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/35c0669a-2b7a-4265-b7c7-fdc09d7ac5b9/koderevupofubiva.pdfIn PDF document text
    • http://jutagejefutix.atwebpages.com/57563747616.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_e6270d21720c4bb2978b2e6fa1365137.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e6694b-4d98-4c07-badb-eff0b687ed89/example_of_7th_grade_essay.pdfIn PDF document text
    • http://lopafulobitap.atwebpages.com/zatotasiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed738ca-6ade-49f4-9f77-9aac686510b0/91037157041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0ea18d-876b-4d48-8992-b3888102c3ce/82172465273.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_ca5fd3498afd430ab822ece6b2dc8d27.pdf?index=trueIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/biomass_carbonization.pdfIn PDF document text
    • https://b01ec662-dec5-4f54-b977-8708717d6054.filesusr.com/ugd/07e02c_d8682126e7b9464cbbb3165fd76d5019.pdf?index=trueIn PDF document text
    • https://29fa80ab-3b21-46a5-a5c9-66d7a3d84e9c.filesusr.com/ugd/eb9fb8_ffc7ed09b8f1453fa912b3e3e3ebd51d.pdf?index=trueIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/faburifep.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_off0000ccaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAF 5596 bytes
SHA-256: d8b6f1feade1ef25c0547a2f2b37b9e4cdd4e006a2240a50cbba40e3621bbc7e
font_01_sfnt_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10372 bytes
SHA-256: 4f3acd1f4e6d5c24bcb4de74c0886265d331023255b38c18bc663f7239b578a7

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