Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a0c127bdf074a6…

MALICIOUS

PDF

101.9 KB Created: 2021-03-20 09:08:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d856d65f51c96ae19cf349c20fdf1e49 SHA-1: 28c7d5503970b7636444397253250af22fe37aec SHA-256: f3a0c127bdf074a665b0a266cb3e322dcd420be42a0e4b6365b6a90ec8888294
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be a link farm or redirector, suggesting it's used to distribute further malicious content or conduct phishing. The document body, though heavily obfuscated, contains metadata related to PDF generation, but the primary malicious activity is inferred from the heuristic firings and the extensive list of suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://botokaw.ru/strik?utm_term=yoga+asanas+names+and+pictures+and+benefits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490251/normal_6051cf927a8d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484399/normal_5feb1a05eaff6.pdfIn PDF document text
    • http://dutarotanazosuv.medianewsonline.com/20762284123.pdfIn PDF document text
    • http://kogefidol.iblogger.org/netflix_android_app_video_quality.pdfIn PDF document text
    • http://moxilekulina.getenjoyment.net/debuliwutunebigaf.pdfIn PDF document text
    • http://devigebogubiret.getenjoyment.net/saxadegof.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/xexokupedejikodotopeku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_604cdac290a09.pdfIn PDF document text
    • https://cdn.sqhk.co/litonesi/VhfiiSf/epic_seven_wiki_haste.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/OsVhaia/bumper_cars_on_ice_nyc_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/vozaxodep/cdGjfX4/gin_rummy_plus_how_to_get_gold_safe.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/2737732e-ccaa-4ddf-805f-9da35bd6391d/pretty_little_liars_netflix_2020.pdfIn PDF document text
    • http://gugifeguxejuj.rf.gd/44274370608.pdfIn PDF document text
    • http://kibagog.onlinewebshop.net/19243596698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1395781d-a32c-43bf-9c17-44f4ae700be6/elm327_interface_bluetooth_manual.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/convert_ipynb_to_py_in_jupyter.pdfIn PDF document text
    • http://nikavavufuxirel.epizy.com/what_is_an_f_statistic_in_anova.pdfIn PDF document text
    • http://lebozid.epizy.com/kususivigujerizotiwati.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/53650938658.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015cb0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15CB0 14320 bytes
SHA-256: 111bb90188e6058a8c880a81c624c8e3cd7e9921478a231f8df4983bdecd489e
font_00_sfnt_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 5544 bytes
SHA-256: 84782557724d4029a5b7b7865371b3852f6adbe618b82aa5077b8c2a1242b314
font_01_sfnt_off000133a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A9 13176 bytes
SHA-256: 8ce577646df84bf3a0288680ecd1b1511dff6ad725c9133e439a807ffbe7badf

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