Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95fe0ae2ce30b05…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 03:39:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d3176f3fdfadf11691cf36400f57c81c SHA-1: 66f8751027444644a6db3604de4f26a5d39ead95 SHA-256: b95fe0ae2ce30b05b0a8a64efde69d5fbbdb6957e818d40ceb95936c0147b2d1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious sites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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://ponafet.ru/aws?utm_term=what+animals+are+not+symmetrical PDF link annotation
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/5233d45f2.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/jjghhig/foliximizogogi.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/marvel_films_in_order_of_story_to_watch.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/jagutizutudonosobokozuz.pdfIn PDF document text
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/7191847.pdfIn PDF document text
    • http://fikakutipid.mygamesonline.org/filo_brachiopoda.pdfIn PDF document text
    • http://wonizojaru.scienceontheweb.net/career_action_plan_template.pdfIn PDF document text
    • https://badazunezibak.weebly.com/uploads/1/3/5/3/135338398/1249019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_6019f906685b1.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/36510.pdfIn PDF document text
    • https://cdn.sqhk.co/zomujugoke/iehfACp/brain_games_for_computer_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vojasipi/kDZctjf/cut_it_off_meaning_tiktok.pdfIn PDF document text
    • https://cdn.sqhk.co/sanobude/Szjcjdx/english_grammar_exercises_book_free_download.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/modified_mastering_physics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_604aba6ba14e7.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/egriiZT/wujobajoromisub.pdfIn PDF document text
    • https://durirumis.weebly.com/uploads/1/3/3/9/133999752/51d588e8b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403960/normal_5fe2e9e30e18e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mizetum.onlinewebshop.net/kuvomizuwifilidab.pdfIn PDF document text
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_8037fe8da4c4497f8a9cde3e899ad812.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_a7f560f525e94ee4978822499f9aa015.pdf?index=trueIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_ba16320eeb4e40c0ae115edb5a418a6d.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_e818a2a6133349a0b8a72d229139935d.pdf?index=trueIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_a776f8373226488bb07421a10f9b721f.pdf?index=trueIn PDF document text
    • http://jelomasulavi.atwebpages.com/vibiwitobexukewir.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_off0000f487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF487 5156 bytes
SHA-256: 5f0a9dcff8ba4a1f6f3e8086aded44372b84975501e5e728f3aafaf6fb8f8e11
font_01_sfnt_off000105f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F6 11160 bytes
SHA-256: 58c249f4c83114b0de90054a3e9d1ed2ae8ed0b98e2d48c6a5a65e4eaf252dd1