Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d2cde628ee422f…

MALICIOUS

PDF

73.4 KB Created: 2021-06-10 05:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 42fd0b9f057936caad616362e311a055 SHA-1: 260b2e08d2490e6ef321d1453325a91e0481e187 SHA-256: a5d2cde628ee422fa1d4b13062d5e8e37edb59e44a23c1432116a6bf8b523c39
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are on disposable hosting and utilize UTM parameters, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://irlanc.ru/pbw?utm_term=madea+goes+to+jail+m4ufree', is flagged as unknown reputation, and the overall structure points towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://irlanc.ru/pbw?utm_term=madea+goes+to+jail+m4ufree PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443624/normal_6026efdf2514d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_601414700aaa9.pdfIn PDF document text
    • https://loxujonukirurob.weebly.com/uploads/1/3/0/7/130776454/58dde3ff18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_601595a8e00fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470412/normal_606dcc2bc07ea.pdfIn PDF document text
    • https://xonidaxu.weebly.com/uploads/1/3/4/3/134319292/db6129c65.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/40351a1a-ad5a-47ba-abc8-08f4f78f04df/mixer_yamaha_mg10xu_manuale.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/police_blotter_sample.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144606432/70603389065.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/9614045377.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/f/mohenjo_daro_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73905fd-23fa-4776-83e7-f3df3293f889/pegewopobux.pdfIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144423924/publication_manual_of_the_american_psychological_association_seventh_edition_2020_isbn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6f3a00-252f-4a93-8cb7-dd5306d1474b/introduccin_a_la_biologa_celular_alberts_gratis.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/f/fijuwusuxafaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4d68e7-ee59-4104-97ad-ec083c98069d/60619730809.pdfIn PDF document text
    • http://redejok.pbworks.com/f/40793732733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58a3b3f5-1a9e-400c-8270-ebbb87b7b7da/bakutemamixokozepexoguvir.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144624981/rise_of_the_tomb_raider_cold_darkness_achievement_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7d223ff-0753-4a23-87f3-bc787e1d042a/campion_high_school_uniform.pdfIn PDF document text
    • http://lifuzopa.pbworks.com/w/file/fetch/144751707/simple_and_compound_interest_practice_worksheet_answer_key.pdfIn PDF document text
    • http://mujusevo.pbworks.com/w/file/fetch/144456399/parabedenonifoxeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed66968-0bb6-4bff-862c-fdcc6ad8d086/alesis_dm10_mkii_pro_drum_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/868b0d99-2ac5-4338-92ae-29e0e8fd8539/duplicado_de_certificado_de_preparatoria_estado_de_mexico.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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 5396 bytes
SHA-256: cc2c1a91b1f15916c1e12fc9d65cd15f9b71e2dd5d61ce1460dd98e48bfe76d1
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 11064 bytes
SHA-256: c4d0aa9e8c810788032dd01269159e24a18ceb7c6c09e11a9609e6ff7adb0861

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