Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df4a4f28aee1a8d…

MALICIOUS

PDF

84.6 KB Created: 2021-03-18 13:56:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c65afb2a6a8bd582925fa88f6c58237f SHA-1: d335364ac6048e63a287cf39223549eb421eee63 SHA-256: 8df4a4f28aee1a8dcf2bae6d499a2994691eb7ce81d0b5939678870c28bf2961
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous external URIs, with a notable concentration on disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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://jumiwimov.ru/strik?utm_term=javascriptexecutor+selenium+tutorial PDF link annotation
    • http://devedilazabu.medianewsonline.com/49709424542.pdfIn PDF document text
    • http://nepufikusugepa.iblogger.org/sulasikawel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_602d9f772d6a9.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/67190031287.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/the_fifth_wave_free.pdfIn PDF document text
    • http://rixiroremijiw.22web.org/greek_mythology_stories_ks2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423171/normal_602e546f7f20e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_60430da3883b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxenedapepobu.rf.gd/bumugosutuvopujobam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a6d8035-04dd-4759-afd1-cf2c6be64f27/75616977803.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_30061a2e6e49452da86ae78b3e08f836.pdf?index=trueIn PDF document text
    • http://badizep.epizy.com/2006_nissan_armada_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929aeef4-6e5c-4f1a-b6bc-358cc454a3a3/como_termina_la_obra_cien_aos_de_soledad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f9c1b2e-2c37-40a2-a340-cb280f6d7a28/abstract_algebra_-_an_introduction_3rd_edition_by_thomas_w._hungerford.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_2d1f76e0e69e4e8aaeb9974d95a7c158.pdf?index=trueIn PDF document text
    • http://luxixeg.epizy.com/tivevovafi.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_11c4240e71c142b6a024fb919d916b27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92db5d64-49e0-4429-9887-5a92cf7e05d8/kiboxifelinetov.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_b90969542b8f408982c8932c47a59f7d.pdf?index=trueIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_636eeea577354296a1542b383ab56121.pdf?index=trueIn 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_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 5196 bytes
SHA-256: dd51fec2de0bb58fbac23c29c66677862865618c8ecd514e3636740d1da9eeb2
font_01_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 12292 bytes
SHA-256: cd76950b8bed400578dda9d361b82bb03013eeed96559cb577d392c0cf236848

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