Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3d6da1d65c21e2…

MALICIOUS

PDF

77.7 KB Created: 2021-03-15 02:26:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5651be064ed0cb42d06442e280844734 SHA-1: 018482d631307f902b8fced3bb2a0fb240364f23 SHA-256: 3f3d6da1d65c21e22ac45ead000b45c00dccf51ec8437a8c97d75bb24f0e1639
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=shackle+type+insulator+pdf
    • http://gagivukamuw.getenjoyment.net/what_is_the_best_bait_to_use_for_crappie.pdf
    • https://cdn.sqhk.co/kobewudojuvo/jihRzjc/rerabijezafumadizuvu.pdf
    • http://pixujuxe.mypressonline.com/cahier_de_dolances.pdf
    • http://sajiwurejedetu.sportsontheweb.net/lelamipufowejujarulus.pdf
    • https://cdn.sqhk.co/wujakegu/dtlibYk/airport_flight_arrivals_auckland.pdf
    • https://cdn.sqhk.co/dejuxafe/aejehjv/do_not_touch_baby_sea_turtles.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sefokirof.onlinewebshop.net/xaxugajunub.pdf
    • https://uploads.strikinglycdn.com/files/c0e96a72-ec86-4a10-88a1-8e48e4dad12a/63508624773.pdf
    • https://uploads.strikinglycdn.com/files/22d8c62e-129e-4b43-9565-10dbfc2a90ba/ti_30x_iis_scientific_calculator_walmart.pdf
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_c5aa1e7ba2574ade9e7ac7ff6646f024.pdf?index=true
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_28e96c1a0bab410581e0fff84efc727a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/27573235-5e86-4aa3-8d7d-02e305426ded/sarah_plain_and_tall_skylark_full_movie_online_free.pdf
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_584a044ad8cb4bb59219efb7824f682d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88b13680-f53d-4ad5-95a9-09c8bd7ff0f0/xuvaxikurobozosu.pdf
    • https://uploads.strikinglycdn.com/files/8af11e5d-d774-4b8c-a927-c3433db2fc97/inteligencia_emocional_por_daniel_goleman_resumen_animado.pdf
    • https://uploads.strikinglycdn.com/files/564c9d4f-af43-4a7d-b44f-036b8b4a7882/pelavefiwire.pdf
    • https://uploads.strikinglycdn.com/files/df23050b-1e04-4ceb-95ea-66c8d94aafad/sleep_sense_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/e9391204-98c1-4a62-b2b8-7041429c6b4a/wewakimakoge.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef75.bin
1c842ac692d7990a17118a5c9863c72dc206934d15a7e9a68568d9d37d31cd5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 5512 bytes
font_01_sfnt_off00010234.bin
2eadfabd8425747bb8e864949f77e4d5b2fd4e880faa08c18253acf1d6dd5ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 11536 bytes

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