Malicious PDF — malware analysis report

Static analysis result for SHA-256 759c81fd05a81417…

MALICIOUS

PDF

74.7 KB Created: 2021-03-04 18:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a310e53d99c2ce1e3e6fe4542219b21 SHA-1: b7dc6ddaa970672e8534df224349b54990ea6864 SHA-256: 759c81fd05a814173458388ea18de766e8724ec7f973125993b71eabcb7abfd5
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/wix?keyword=nova+launcher+beta+6.1+apk PDF link annotation
    • http://universe1.space/speed_car_racing_free_arcade_racing_games_ps4xlnvd.pdfIn PDF document text
    • http://indital.fun/britax_marathon_convertible_car_seat_height_limit40voa.pdfIn PDF document text
    • https://dexidexida.weebly.com/uploads/1/3/4/2/134235246/bea629928.pdfIn PDF document text
    • https://guxumexowe.weebly.com/uploads/1/3/3/9/133999944/b9ebcfe4.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/bamobujejaxevop.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/7184159.pdfIn PDF document text
    • https://lisomoduxu.weebly.com/uploads/1/3/1/3/131383329/bepuvelusalajinelene.pdfIn PDF document text
    • http://lamatokatov.22web.org/all_things_are_possible_through_christ_who_strengthens_me_kjv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pitugozuput.epizy.com/chevrolet_optra_2009_manual.pdfIn PDF document text
    • http://divojeniro.epizy.com/memabag.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_943cd145c8d94d9697fb285ccc24f04f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cbdd9f-b08f-4e88-b4d9-4b77cc395c92/30551728444.pdfIn PDF document text
    • http://kalilom.epizy.com/marbury_vs_madison_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12c98f9-a4cd-4b50-a44a-30b2163f2649/is_cadmium_paint_safe.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_76172e636c7b412e9005d581dc5a874f.pdf?index=trueIn PDF document text
    • http://bosewavim.rf.gd/40684796067.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_4e5567852bd44283821da392170ffb8c.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_45186210d934493f931f9deacda04832.pdf?index=trueIn PDF document text
    • http://vatasinunevuto.epizy.com/temodazekagikimases.pdfIn PDF document text
    • http://jigotukaxeze.epizy.com/los_renglones_torcidos_de_dios_resumen_captulo_a_captulo.pdfIn PDF document text
    • http://vaxilokenifak.epizy.com/20280847690.pdfIn PDF document text
    • http://petizitopebil.epizy.com/the_disaster_artist_download_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db467be-1c81-4993-b49c-9c5a3adf07ed/kindergarten_math_practice_book.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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 5316 bytes
SHA-256: 7e2ba31a4f951786c3fc402cff093137ae498f6430f8eff2947cb7ea7a2e4d29
font_01_sfnt_off0000fa4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10148 bytes
SHA-256: 2ce789817a4f26e1dd32ddbf6223cb373d67917b92a6dbe15f353d7f56fb66c1