Malicious PDF — malware analysis report

Static analysis result for SHA-256 671b4382c48c0207…

MALICIOUS

PDF

74.6 KB Created: 2021-04-04 21:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c9f0a02c2106be84efbb48c9f3dac012 SHA-1: b334b4261b2becb763c57f22339c91c4e80d9043 SHA-256: 671b4382c48c0207297185f65f7d937035dc951028f394592b788926431d42fe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=how+to+print+from+laptop+to+hp+deskjet+2540 PDF link annotation
    • https://cdn.sqhk.co/tumupowe/icwjhsH/17209562161.pdfIn PDF document text
    • http://xelipev.22web.org/yvr_arrival_information.pdfIn PDF document text
    • https://cdn.sqhk.co/zukivutos/hhoj6CZ/light_meter_camera_definition.pdfIn PDF document text
    • http://pupumokenelet.22web.org/electrical_theory_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/p7vwugq/17339227159.pdfIn PDF document text
    • http://nafarami.medianewsonline.com/who_supported_johnsons_reconstruction_plan.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/how_to_put_a_bobbin_in_a_sewing_machine_singer.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/c16ef6bf-1faf-4004-b4e9-afa031b148ac/is_anxiety_psychosomatic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d7aa63-b1d2-49eb-b983-e231f59897ae/2058977963.pdfIn PDF document text
    • http://mefeparoleban.rf.gd/buku_biologi_sma_kelas_x.pdfIn PDF document text
    • http://loletusu.rf.gd/sujimapepagimagulotukez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3afa78-8b51-4b74-94ef-3c9f04f540be/50855720550.pdfIn PDF document text
    • http://lusitenaburasow.epizy.com/tecnologia_educativa_concepto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1263002-c900-432c-a1b6-e9bacebd59a2/41043625818.pdfIn PDF document text
    • http://rulalovurodaf.epizy.com/compare_and_contrast_war_of_the_worlds_book_and_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964e0b01-43ef-4d0a-894e-3f7fb1ff3912/dololapa.pdfIn PDF document text
    • http://zorijofoxafa.epizy.com/lagaxuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ad8f32-fb64-4c16-b071-ba2995368f1c/howl_poem_critical_analysis.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FF 5960 bytes
SHA-256: bc18bb1431276abc3ba77dee675c28f807cadbae415eb9bdd6d03d2dbc390fa4
font_01_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 10520 bytes
SHA-256: d8d86a385fa8605d457508341db46e04266822e4901574b942ccadc7c1be0be4

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