Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bf445c50902b7a…

MALICIOUS

PDF

85.5 KB Created: 2021-05-05 20:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 366362aef5a65fa12aeaf57c1e97b6cf SHA-1: e55a07a448d52478e996e3a4cb15c9fefeb6084f SHA-256: 28bf445c50902b7a2a7e10993c9f2f02029a0f186222a849576dc36ddb3276fc
156 Risk Score

Malware Insights

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

This PDF document employs a link farm technique, embedding numerous external links disguised as relevant content. The primary malicious URL, 'https://xajibur.ru/strik?utm_term=como+se+elabora+un+manual+de+organizacion+de+una+empresa', is likely used to redirect users to a phishing or malware distribution site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute malware through a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/strik?utm_term=como+se+elabora+un+manual+de+organizacion+de+una+empresa PDF link annotation
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/c847348c.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/mNKnifq/31799139187.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/feaiahc/1325945936.pdfIn PDF document text
    • https://raxugujelagad.weebly.com/uploads/1/3/4/1/134108814/5783205.pdfIn PDF document text
    • https://cdn.sqhk.co/govizanorev/9ijohe0/nintendo_switch_tetris_99_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/jgAja92/436366367.pdfIn PDF document text
    • https://cdn.sqhk.co/fisoxinizo/4hbhihd/cfop_f2l_algorithms.pdfIn PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/kumalufewodidub-riviki-fofawob.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/kelajibepufafo_jeparugasadup_nogezuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/nivanejimukijukotofi.pdfIn PDF document text
    • http://buvanudune.rf.gd/definition_of_appendicitis.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/casio_fx_115es_plus_only_shows_fractions.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_e3309c4c74724a4384b0836a9fd871dc.pdf?index=trueIn PDF document text
    • http://wubexemetaxoru.epizy.com/the_casino_job_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/what_is_computational_number_theory.pdfIn PDF document text
    • https://52cfbdcc-51c1-4e85-ba83-ad74149b4620.filesusr.com/ugd/93d431_7614f7a3713744ada22fe0d150129c24.pdf?index=trueIn PDF document text
    • http://wozetarep.rf.gd/86477893878.pdfIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_81117e8479664f4ab00f88685750f86b.pdf?index=trueIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_a86e497b860747d39274d5cd54654f27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/cristianismo_antes_da_reforma_protestante.pdfIn PDF document text
    • http://gexazavere.epizy.com/violin_varnishes.pdfIn PDF document text
    • http://galopaxuvubopuj.rf.gd/2002_honda_rancher_350_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/questions_about_theme_of_a_story.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_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 5488 bytes
SHA-256: 895543cc611ec32ec29f0267031b2328f3648f92369ad4e16f929151535d3fb0
font_01_sfnt_off000120ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EF 11568 bytes
SHA-256: 15731f7ccad2543cc0ea1987ab664a477150805b28b9224d2d28c2da6aef2507

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