Malicious PDF — malware analysis report

Static analysis result for SHA-256 244d84290c598038…

MALICIOUS

PDF

80.5 KB Created: 2021-04-04 09:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5d486f70463868267d246bd31d8bda3e SHA-1: fee4e5ff6936b28cab1c294a858e2cd0466688b5 SHA-256: 244d84290c598038ac18b4411df0b9d330b2a64585a3e356b56051a8dc1edfe5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for SEO poisoning or phishing, directing users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=short+stories+for+high+school+reading+comprehension PDF link annotation
    • https://makurabun.weebly.com/uploads/1/3/4/6/134651698/numapofoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465924/normal_5fc673501e9d8.pdfIn PDF document text
    • https://fesitafixob.weebly.com/uploads/1/3/4/6/134653549/6586756.pdfIn PDF document text
    • http://urolog.xyz/graph_the_solution_set_of_each_compound_inequality8iv6e.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/dosilomojesomag-pipajupol-vurafaza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5fcf84ebf352d.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/vejiga_neurogenica_diagnostico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502464/normal_5fee68ff54e9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5ffc3141a55af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_5fda8d5eec2c9.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/xakilenop.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/whats_another_word_for_non-aggressive.pdfIn PDF document text
    • http://richmaya.site/sniper_master_city_hunterdvs0p.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
    • https://c7ecfb45-4de9-4174-91ae-4a3416e09b0d.filesusr.com/ugd/fc4f66_16e3e9ff2db54babbae2ffb57f7b71e7.pdf?index=trueIn PDF document text
    • http://rosajeku.myartsonline.com/printable_calendar_year_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab27e4b-8b66-42ec-8f36-b5bb46c92d5d/apc_smart-ups_1500va_lcd_230v_smt1500ic.pdfIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_78b7d55afc8a437fb185b08bbb786fd5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/457fb897-9970-439c-9b6d-b4be24ac3fed/82868834142.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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 5460 bytes
SHA-256: 94d205fc9c665d87f85f092306168bb1ba00fbcae8666a9558b7b21c0f313ff0
font_01_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 10704 bytes
SHA-256: 8e0f3efaa566a47fef66c874d11a2cd5aa8c7835f4b237c0831b1afd703cff88
font_02_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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