Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffe4d2e711415f6…

MALICIOUS

PDF

90.9 KB Created: 2021-03-06 08:23:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85bf667b7f229e116293af9f96d3bbe4 SHA-1: 1b25fd970fba034fc44070ee015862eb3eb201aa SHA-256: fffe4d2e711415f6af38892c1c9d9f5d2b75833c358c0094973852e8d241bdec
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/123?utm_term=do%2523m+acorde+piano PDF link annotation
    • https://cdn.sqhk.co/figegixo/fo4crNo/fogitazivibavebafexo.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofidipo/ifnKJV4/storm_bowling_balls_10_lbs.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/KiehjNb/extreme_moto_game_download.pdfIn PDF document text
    • http://remontlegko.info/bescherelle_italien_grammaireg33ri.pdfIn PDF document text
    • https://cdn.sqhk.co/banifiga/ejegeib/color_block_sweater_mens.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/covid_19_testing_in_my_area_free.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/gijcjif/zenoda.pdfIn PDF document text
    • http://nextauto02.ru/ios_11._4_beta_2_profileqs6wy.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/38253384543.pdfIn PDF document text
    • http://my-favshopc.online/marketing_plan_example_word4eybv.pdfIn PDF document text
    • http://pimifawimonidij.mywebcommunity.org/that_will_be_fine_faulkner.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/rLjgkjh/23533861049.pdfIn PDF document text
    • http://quickpapp.online/comlex_level_2_ce_score_report2zr3q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_97bb1fdb380d413c87efc8bfec5f5a5d.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_2a9cc302e8234956879f4c5bb87f1ce2.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_88f8d8a6adcd4362b41a0752e77bf5b4.pdf?index=trueIn PDF document text
    • http://kewetanetoza.atwebpages.com/lunatuzunonuna.pdfIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_8001eea41d7e4af6b7f1edb2edf7acc1.pdf?index=trueIn PDF document text
    • http://rovizomaguwex.atwebpages.com/us_attorneys_office_jobs.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_aa080cd9dec14115aa997e376485b35b.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_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 4156 bytes
SHA-256: bae8c65fbb2985f8f9e3f3f2bcf16a0f9e8e1e4a7d5ebf1135d71e3fbc9ddb2e
font_01_sfnt_off00013609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 11788 bytes
SHA-256: 35d8e7f4823158865a64e18ff1aa600bc518b1d6ea912f4feb52a9749039e239

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