Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1db68c680b587f2…

MALICIOUS

PDF

68.6 KB Created: 2021-03-07 13:33:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 557c68c45032c4e711c8e128dd54278b SHA-1: 8a89d5a2b57049a16c5f351c893aba96aaa62c7b SHA-256: f1db68c680b587f26e830ab9675bbbfe449e31ebb0d5fc0ae9f1830a136ced59
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicative of a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=biblia+con+concordancia+strong+online PDF link annotation
    • https://taburexil.weebly.com/uploads/1/3/4/3/134374137/6870602.pdfIn PDF document text
    • https://cdn.sqhk.co/powurejur/jXgdhgd/basketball_stars_2019_unblocked_76.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/ignjfJH/lazavino.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/pozikevag.pdfIn PDF document text
    • https://cdn.sqhk.co/fularulojoze/gigiPgg/wyvern_terraria_steam.pdfIn PDF document text
    • http://fumerox.iblogger.org/47193521124.pdfIn PDF document text
    • http://optamorem.com/saxapukalemez4a.pdfIn PDF document text
    • http://smeshnoykir.space/outbreak_perfected_destiny_2_wikio7ald.pdfIn PDF document text
    • http://lnstagramsupportlives.com/342753236012wh98.pdfIn PDF document text
    • https://cdn.sqhk.co/vipatajase/Aia6jjd/car_tax_and_title_calculator_alabama.pdfIn PDF document text
    • https://zivozisexime.weebly.com/uploads/1/3/2/8/132814465/gawovisar.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/xijazubitezix.pdfIn PDF document text
    • http://bu-markett.com/books_to_read_if_you_like_flowers_in_the_atticv1sjw.pdfIn PDF document text
    • http://tehnomaster.net/bhula_dena_song_free0yrbb.pdfIn PDF document text
    • http://qupieasy.online/cuanto_equivale_milimetros_a_centimetrosgbiov.pdfIn PDF document text
    • http://jiletos.22web.org/27447772903.pdfIn PDF document text
    • http://zoosalon.org/excel_quotation_template_with_database3awfn.pdfIn PDF document text
    • http://biomaniix.website/totubomojenovekivetemsewp6.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/hjOhbjh/25821607896.pdfIn PDF document text
    • http://dizurexemubegog.mygamesonline.org/84388067398.pdfIn PDF document text
    • http://losqutoq.online/43128605255z08m9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekubegem.epizy.com/3d_landscape_wallpaper.pdfIn PDF document text
    • http://muwided.rf.gd/newspaper_report_example_grade_6.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_off0000cc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC81 5296 bytes
SHA-256: cd9799a3c149a3fa2175bd8317a0012465746138787ac5c1533ddc4b1e7f7644
font_01_sfnt_off0000de8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 11532 bytes
SHA-256: f1dda8cf461484f0848eb30029b7e2bf1c778db7c84acbf5028a282591d2cfc7

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