Malicious PDF — malware analysis report

Static analysis result for SHA-256 596543a69b6c8b12…

MALICIOUS

PDF

71.6 KB Created: 2021-04-01 06:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da013b6084a493a06a7c29221cc69313 SHA-1: 4048f0759a23861fabbe60970a4768a6432396fa SHA-256: 596543a69b6c8b129e606b75c906adf0f6bffc3777e9fd6356a3529878372b72
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://jottigo.ru/123?utm_term=android+view+background+color+selector
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/wowir-kurikavap-lesaxifelos-fujuwarixodusag.pdf
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/xiwixolitisafiwis.pdf
    • https://cdn-cms.f-static.net/uploads/4443619/normal_604d1cde0d9cf.pdf
    • https://cdn-cms.f-static.net/uploads/4387814/normal_60396eb770d6d.pdf
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5ff64c478eeaa.pdf
    • http://kexawez.mygamesonline.org/89570487924.pdf
    • http://zabovawupe.mypressonline.com/aws_cloud_practitioner_certification_questions.pdf
    • http://form-lnstagramcopyrightservices.com/12261767955lo6wi.pdf
    • http://argo-tourism.com/introduction_to_operations_research_10th_edition_by_hillier_and_liebermanmtylr.pdf
    • https://cdn.sqhk.co/didatife/kMzv6mE/99503295222.pdf
    • https://static.s123-cdn-static.com/uploads/4384822/normal_5ff1759389ebf.pdf
    • http://xuxodowenam.getenjoyment.net/1845338623.pdf
    • https://cdn-cms.f-static.net/uploads/4375194/normal_604e29ae44dd1.pdf
    • http://wekeb.space/96273140212859ai.pdf
    • http://rowowesofazov.medianewsonline.com/30_day_muscle_building_workout_plan_without_equipment.pdf
    • https://junowebabozem.weebly.com/uploads/1/3/5/9/135965754/kozok_masem.pdf
    • https://cdn.sqhk.co/kakapoxavu/ijifYjh/world_nature_wallpaper_download.pdf
    • http://vedice.ru/94935091271g2z1l.pdf
    • https://fejuratomejavud.weebly.com/uploads/1/3/0/7/130776174/3489735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://viniwowosur.onlinewebshop.net/antonyms_and_synonyms_word_list.pdf
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_9a07b288d2dc49ac911d407d1a289a16.pdf?index=true
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_f474a523a6474266919f89116a79f1e9.pdf?index=true
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_fd78849a623a44d4bd1df91d94a25819.pdf?index=true
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_4a01ee79051a43b89d901c50501adb48.pdf?index=true
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_8dd5e1b46da64f57aee5a4293ac50acb.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf75.bin
a7a1ce1e8c56ac3e42d661010c4131db6ed56e49a14a220ef0c7e01248864e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 5452 bytes
font_01_sfnt_off0000e225.bin
4b0244cb8faaa4f5b10137f0254382022661c68ea6805e6b81b42ac2a0b5d5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 14212 bytes

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