Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da1805c380bd5c7…

MALICIOUS

PDF

73.8 KB Created: 2021-04-21 05:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e934fe97a6a0e80ad260913ed01b5665 SHA-1: e5264b60e1aee630072d751195077e3431163a44 SHA-256: 8da1805c380bd5c7a47f3360029a12bcd0f446e11ff000751beb6c917fe8c407
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of embedded external links, a technique often used for SEO farms or phishing. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://fokemale.ru/strik?utm_term=brownie+potter+badge+requirements PDF link annotation
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/kavolo.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/JjaJja6/chief_information_officer_nhs_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/gdhb2m7/super_dancer_chapter_2_winner_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wowedofu/R1Fui5E/25428567762.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/hiihijk/wallpaper_hd_4k_mod_apk.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/tubumo.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/d1a3a7d9-044d-4298-9a6e-4ea27aea0618/39283504474.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/garnet_hill_supima_flannel_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9b4343-9c44-4950-ad80-41e78331267a/what_is_the_best_robot_vacuum_for_tile_floors.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/maslach_burnout_inventory_free.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/anjathey_tamil_movie_audio_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8a3dcf5-ee5e-493e-9c4f-ff1634b3ad11/the_trials_of_apollo_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4232a2-37a9-4e41-b57b-21dd45acc691/jiwuxujelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f21955c-8f8d-4ec6-97ce-890c99b6eacf/xopalokes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faa795a0-5b1f-48d2-ba81-6fba2834726e/jokegonoxodekejijatile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d079a6f3-6ee3-44bf-85e5-095eadb99829/two_step_cluster_analysis_stata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f529d2b-bed9-4020-a4d1-efb1471ef93a/97463856449.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/are_ryobi_drill_bits_any_good.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_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 5656 bytes
SHA-256: 57c624630881ec56987ee2c27fffd5a1f22f1dddb6bc0e3d1d9e6deb9701bd46
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10744 bytes
SHA-256: 82ea053ef7178c9cd1f4c1d4da9b88f34f8dc020ff4259b4378428ef96c1b18b

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