Malicious PDF — malware analysis report

Static analysis result for SHA-256 594853ed40b83c16…

MALICIOUS

PDF

78.5 KB Created: 2021-03-04 14:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f8dd9ad812a76791be8b63b80bb12605 SHA-1: e1ecf09d149dafb3faf3aa1a1ef1cc13244adc47 SHA-256: 594853ed40b83c16e7028abe0725e75c3c7333a69b8d6c5e4fa663a427cbfee7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains a large number of external links, many pointing to other PDF files, consistent with a link farm or SEO abuse tactic. The primary URL observed is https://jumiwimov.ru/wix?keyword=briseida+y+aquiles+mito, which is likely part of the distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=briseida+y+aquiles+mito PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469847/normal_5fde0fb1cc870.pdfIn PDF document text
    • http://piredvizhnik.com/fanovixegaludejovezawofudlccp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_602061d75c8ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_5fd60e3c3f5b9.pdfIn PDF document text
    • http://agencymedia-ig.com/l_encyclopdie_de_la_charcuterie3a3vf.pdfIn PDF document text
    • http://sushibara.net/engineering_mechanics_statics_14th_edition7gxja.pdfIn PDF document text
    • http://lenudes.com/super_pinger_pro_1.1.3_mod_apk7rft2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_3d3605fa1b4d435c97f444b85c58c93e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kufazete/balearia_denia_formentera_un_dia.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/night_shift_cast_season_3_episode_3.pdfIn PDF document text
    • http://luwazogibuj.rf.gd/8939519137.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_b3c0624f210a4b2bb18b27cc85d049d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/36053912371.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/pofivazexanamufu.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/miwemopeniwatajis.pdfIn PDF document text
    • http://kojajopi.epizy.com/graphing_trig_functions_worksheet_with_work.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/92625792145.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_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 5248 bytes
SHA-256: 7011dd59d4ff22598f428bbe3ecff1854c986453318c8c0fc30e889c576aa415
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 11324 bytes
SHA-256: 2fbc0df9acca0c1d5e5878470d3023a214ede3d34ab5f19f520243796b4d6d78

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