Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb685e4213fa2b6…

MALICIOUS

PDF

82.8 KB Created: 2021-04-02 14:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3d3fa6962b82ca7888304c87c27add8d SHA-1: 590eb3e033c16a1d7ed8b77a133e48591d3f17f1 SHA-256: cdb685e4213fa2b644343050478b7552cc2d26ad0c0c8bf04d29309ad5a2fb1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=how+to+cite+online+pdf+apa+style PDF link annotation
    • http://kofojoxake.mygamesonline.org/human_anatomy_and_physiology_cardiovascular_system.pdfIn PDF document text
    • http://liolika-rsya.ru/18736987199yxft1.pdfIn PDF document text
    • http://thedouche.xyz/529588617823h2ls.pdfIn PDF document text
    • http://psychologyrelax.xyz/jezifatofegokitogezam8ec5.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/how_to_reset_my_soundpeatsn7dtd.pdfIn PDF document text
    • http://itawegan.fun/99766331051qcaqf.pdfIn PDF document text
    • http://moneymaya.site/79349127634rrpac.pdfIn PDF document text
    • http://tobafiga.medianewsonline.com/because_of_winn_dixie_book.pdfIn PDF document text
    • http://mirumumavetifun.mypressonline.com/wiveraxa.pdfIn PDF document text
    • http://nebuxopav.mypressonline.com/tagubo.pdfIn PDF document text
    • http://usacarins.com/20349300437aaor.pdfIn PDF document text
    • http://2020coupons.info/29773918298pvtzp.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/tidigudetefumof/mifodelafiso.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/tupperware_catalogue_august_2020.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/69547124486.pdfIn PDF document text
    • https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_8a4ad89c6ff045a2b2e0379c384b5320.pdf?index=trueIn PDF document text
    • http://bememikat.onlinewebshop.net/zipiku.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/bebas_kai_font.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/zorimotopujeviluda.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/construction_building_design_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/skyrim_too_many_texture_mods.pdfIn PDF document text
    • https://a8d7b256-15f4-4349-8263-7c04dac60073.filesusr.com/ugd/2d797c_2e5d616558864d238cd571f5463ff6ff.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_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 5208 bytes
SHA-256: b20181f2ab569df595f0ec755d5353e26ee2119d6e2120a4d44d6ede3dfb6337
font_01_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 11320 bytes
SHA-256: 674774d3483e46e347866f42743330281104117d86069e3929e8a9fac9c9b93c

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