Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b35f1f4abc4a114…

MALICIOUS

PDF

87.1 KB Created: 2021-03-20 18:42:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 7ac329a67c02c36bc9a63667f440b51c SHA-1: 2208c96e4599f210200b241dc15c5417ae25fe44 SHA-256: 1b35f1f4abc4a114150ad7da5ca425698ef3eefe9d26fab28fa6c13ebc7bc3f1
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many pointing to disposable hosting or suspicious domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://dugedepap.ru/strik?utm_term=los+derechos+humanos+son+universales+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384820/normal_6025884087f67.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/archaeology_and_humanity_s_story_free.pdfIn PDF document text
    • http://gedagefi.22web.org/jafozagibefatifuvojon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5fdbd73b35909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481156/normal_604b035a79cce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378623/normal_601ddddc975ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fe63b5a8f839.pdfIn PDF document text
    • http://freshmind.net/tutuxuvozobabi3u6mt.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/maths_formulas_for_class_6_to_12_in_tamil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416302/normal_5fc9951d27ae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fcdcb0adc120.pdfIn PDF document text
    • http://kuwawaf.mypressonline.com/xepaborojope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_6032162380688.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5ff45a1e4e261.pdfIn PDF document text
    • http://modernstyle.pro/is_2.4_amp_charger_goodv6j13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_6032ad8320cd8.pdfIn PDF document text
    • http://interplast.ru/descargar_befunky_photo_editor_apkmbe2f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_fdf0521501ce45ae93a62cab33ff5c61.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_ce8865a8ef28449fa4c0ae8431da39f9.pdf?index=trueIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_f3515b1b665d4d259e03d5f946bd9a17.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_52897d63cc584f6984b30cab8566b13e.pdf?index=trueIn PDF document text
    • http://wikidupuzok.epizy.com/bootloader_samsung_galaxy_young_gt_s5360.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/11697172007.pdfIn PDF document text
    • http://tojuributesef.epizy.com/jigutivamiw.pdfIn PDF document text
    • http://kafojifonetawaj.rf.gd/online_dbt_therapy_for_bpd.pdfIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_8fa2798f191c4c4eaa657e1606d1b858.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 5192 bytes
SHA-256: cbbbcfa900b5e15c42644b32c91e9c88d160a57f0b84ca9732fb74f03b1b69cd
font_01_sfnt_off00010e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0A 1584 bytes
SHA-256: 45e48b104d5dbc06124be1b89692f70bfc61c2138fdc14a0d64e3dfacae26d06
font_02_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 12104 bytes
SHA-256: d8d1008a617ccdc198a86e531ed7b1e36f757b35fe988b477a7f95f33e5be447
font_03_sfnt_off00013d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D97 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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