Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1a616e887a546f…

MALICIOUS

PDF

81.9 KB Created: 2021-03-26 04:36:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 99552eefc2ae15e4b442b00a47927fbc SHA-1: 90da8093a2aa0899e3df2298a6ac69f6b3e53b55 SHA-256: df1a616e887a546fa4a01a06946d35e6f56ff42067de4b08fbe83bf1f95d9db6
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('jottigo.ru') that is likely used for phishing or malware distribution. The PDF structure and the presence of embedded URIs suggest an attempt to redirect users to external malicious content, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=is+the+outsider+hbo+good PDF link annotation
    • http://dosaxurezifoset.22web.org/rukilebego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_60385003b35cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403814/normal_5fe2be0a860a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491723/normal_5fff308648a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_5fd3ce779fd0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494674/normal_604621b627ae0.pdfIn PDF document text
    • http://wutanitof.22web.org/96732964547.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_6bcf5933624747aab9954dc8ec19603d.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_b4b619c648f0461d94e1e1929c0297ec.pdf?index=trueIn PDF document text
    • https://235a1a37-2bc9-4d3b-8f1d-d3952ad9fba8.filesusr.com/ugd/3111f7_d2c394d2612347a7bf52129b683aa6e0.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_f5fec71d06d04c59ac11a8beeb311659.pdf?index=trueIn PDF document text
    • http://joxuziroran.rf.gd/emulsion_polymerization.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_ecd8882771a148358b520d6f6da80f3b.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_9d5f7b3fc68a4ce094079105c6a147bd.pdf?index=trueIn PDF document text
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_4ea674d93d8c4aa8b39f3792bfd75f9d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/aditya_birla_mutual_fund_redemption_form.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/vuridolanirixuro.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/business_communication_solutions_-_bedford.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_f25374abc61645e98e5ece81c0a4596d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/bachchan_bengali_movie_video_song_hd.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_d40cbbe71c514cbc81bf224f1f9aa766.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/nassim_nicholas_taleb_married.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_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 4924 bytes
SHA-256: 5c41dcddf2d727f3b8f8eeaebe35acbb8a60ac09c6de76e955107ef7255972c7
font_01_sfnt_off00011430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11430 11184 bytes
SHA-256: 44432aa25282dc90ef9bc934e72af26037c5db5767a87a32fe723469f186ee31

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