Malicious PDF — malware analysis report

Static analysis result for SHA-256 37190647fdab73f9…

MALICIOUS

PDF

73.1 KB Created: 2021-03-01 20:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: fec780f6431d6d0fd383a4765b978e39 SHA-1: 9fd7906ce19eb20d45e8168d96636a501540bad1 SHA-256: 37190647fdab73f9058e79b20234307e998c45424ce0824ccac6a2a7207de3d5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or second-stage payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/wix?keyword=the+six+kingdoms+worksheet+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420588/normal_601fb7b8a10c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484154/normal_5fe2ca88d93e3.pdfIn PDF document text
    • https://sonenekuz.weebly.com/uploads/1/3/5/3/135302947/buveburotabotole.pdfIn PDF document text
    • http://clubstore.pro/cuales_son_los_sintomas_de_la_neumonia_viralocnuq.pdfIn PDF document text
    • http://inostrana.com/cooks_essentials_pressure_cooker_beef_stew_recipes255y9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_602ab1d255ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374682/normal_602207e31c363.pdfIn PDF document text
    • http://elerctum.org/calvatia_cyathiformis_recipe0p8sl.pdfIn PDF document text
    • https://dejamemetegabov.weebly.com/uploads/1/3/1/8/131856029/9558922.pdfIn PDF document text
    • http://help-copyrightservice.xyz/how_to_download_autocad_2020_in_laptoppubmt.pdfIn PDF document text
    • http://loleveze.iblogger.org/selimumag.pdfIn PDF document text
    • http://kyponnik.online/scratch_programming_games25zhs.pdfIn PDF document text
    • http://connexion-amelii.xyz/sogiloxumevujulatumezixudxdxn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://misibumisap.rf.gd/kindle_4_hard_reset.pdfIn PDF document text
    • http://mesobuze.epizy.com/movies._com_tamil_2018.pdfIn PDF document text
    • http://nanolato.rf.gd/civic_education_notes.pdfIn PDF document text
    • http://zepukedosapiw.rf.gd/batejuwifolesadatijuropik.pdfIn PDF document text
    • http://vutakeba.epizy.com/38710634499.pdfIn PDF document text
    • http://zeluzara.epizy.com/dd_5e_monsters_by_environment.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 5060 bytes
SHA-256: c0a5e319df23e6ae17b8c83aede185ea2f9f79031b9cbd7835d3500333a66261
font_01_sfnt_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 10324 bytes
SHA-256: c0f61a0bb11f783a6c90ab77d9f7ef51cc394562f42e91491d7ec73b5fb95c84
font_02_sfnt_off000108eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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