Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9958f81da4f6bd2…

MALICIOUS

PDF

75.5 KB Created: 2021-03-18 07:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3d9fc7a1d6270a0c729e870c89a1acf6 SHA-1: 2105887332f4c23435ea8f95d70258717b5cf89b SHA-256: c9958f81da4f6bd2508619a0d1a4c9370b75b8190bc6167835e542d80cc370c3
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 0.9991

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://gimoguvi.ru/wix?keyword=baldwin+filters+dealer+in+uae PDF link annotation
    • http://rovanenafet.getenjoyment.net/apnea_del_sueo_en_adultos_mayores.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/23797465696.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/hafgfGP/drive_in_idle_tapper_game_hack.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/jepikakuj.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/idggmha/happier_camper_owner_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/terasovo/J81ieyg/master_sniper_strike_free_sniper_shooting_games.pdfIn PDF document text
    • https://cdn.sqhk.co/jirozixo/Y7Dhjjc/xomazoguzepa.pdfIn PDF document text
    • http://gedirobidepud.scienceontheweb.net/mexikitix.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/gQveYRI/cut_your_own_grass_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hjdVRKM/running_warehouse_returns.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/bTSYYi8/pottery_barn_outlet_alameda_yelp.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/wajomiwogodat.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/lalowadenar.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/gihu7gf/wuvarulivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_e0192b7cffde471c862344868a488ae0.pdf?index=trueIn PDF document text
    • http://tiluxusimutine.atwebpages.com/83238375998.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_fa0de82cf5954b978234d674f2723c0f.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_c7786a6639234e488530bf06fd58474b.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_9cc0f66a1ee847bda641765f64307dd8.pdf?index=trueIn PDF document text
    • https://aa4a64a1-c69a-4176-9ab9-82648dcabbba.filesusr.com/ugd/70701b_ec5bc15aa0ba40859043897523ec4e30.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_5abdff6a410f4a2f8d380576fd6b3a2f.pdf?index=trueIn PDF document text
    • http://pudugivifo.myartsonline.com/cardiovascular_physiology_questions_for_self_assessment.pdfIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_3f292b7004c0463396b6c6cc7c59beea.pdf?index=trueIn PDF document text
    • http://gozenabuzixi.onlinewebshop.net/stihl_sh_86_ce_shredder_vac_blower_reviews.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_off0000e89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89A 5040 bytes
SHA-256: 6fa5d3926138c5cd48fc2c3aa19f3fe5b917eb611702a8aeb3f506476457b635
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 11456 bytes
SHA-256: ef1afa3664cdbebb33f5a77fac33f239950953dbc00f3ae5165b95abe6f4a88e