Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af2ec3899dde596…

MALICIOUS

PDF

79.5 KB Created: 2021-04-15 10:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2ac89f2f32b98b3cbe6a8c12f8795926 SHA-1: b01508a764e30bc36371706b42c6f2d2a94bc79e SHA-256: 8af2ec3899dde596d5b6409f2b44abb1917431663438f2f63c2e7649158c2816
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary malicious URL being 'https://gimoguvi.ru/strik?utm_term=ejemplos+de+dialogos+informales'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://gimoguvi.ru/strik?utm_term=ejemplos+de+dialogos+informales PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414339/normal_5fecc7f66b5da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481270/normal_601702284807c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_60635a0b03817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_603ccad2a3057.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5ff03a4b7e719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_5fdc17bc796a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_5fd7903b42c51.pdfIn PDF document text
    • http://tadukesavexufe.22web.org/regusopukiko.pdfIn PDF document text
    • http://xobifiniz.iblogger.org/beethoven_moonlight_sonata_piano_sheet_music_free.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/tojabixefova/3d_anatomy_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/arjun_reddy_hd_movierulz.pdfIn PDF document text
    • https://2aa89031-56ac-4de1-b828-aabe99840ec8.filesusr.com/ugd/cf14a4_c606810012aa45c2b270fdafc57dc74b.pdf?index=trueIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_a4c8b324f46e48ee87a49a7fdaffdb6c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kufazete/xinisu.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/is_breath_of_the_wild_the_best_zelda_game.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/declaration_of_trust_template_free_australia.pdfIn PDF document text
    • http://gerobuzu.epizy.com/52586434324.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/63512311091.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/how_to_recover_facebook_identity.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/45477764522.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_d2876d585e0c48918c62cd375d1ca6b1.pdf?index=trueIn PDF document text
    • http://ronojegev.rf.gd/file_b_o_ngc.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/46336920325.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_7f914e532fed45f9b77bc9303aad8436.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/46726890896.pdfIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_f4ddbb5543784ea6a9fc57cd94075d3c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 5396 bytes
SHA-256: 49b6264ba8d2dab4c9fc616941c84015e838a27a35b1b3fbfab62a8e577e30f7
font_01_sfnt_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 13508 bytes
SHA-256: 108b17ff0c1173e3632927ce5bdc78eb0588267e2be29ef9997a7e38ce32ad79

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