Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe71215ccf583f8…

MALICIOUS

PDF

73.4 KB Created: 2021-04-14 16:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 761145d2c7c4526d920e38aa94af3b75 SHA-1: 1e2201ef118df017efad46d7fb644dc011e219ea SHA-256: 5fe71215ccf583f8ec626c6243219c96ed4e21b1d73f77fd8f82b6504f0aa08b
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 0.9997

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/strik?utm_term=muscle+building+workout+plan+at+home+pdf PDF link annotation
    • https://kisebuketi.weebly.com/uploads/1/3/4/6/134657705/zijivota-gozuwezasaporad-xesoxex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_606ad3174dc96.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/gegjwha/value_proposition_canvas_questions.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/canon_mg3520_user_manual.pdfIn PDF document text
    • https://sowobufujugazid.weebly.com/uploads/1/3/0/8/130873997/7528169.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425491/normal_60622b46b6af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_604189a158906.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/cJkzlhj/gravity_movie_plot_synopsis.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/9e60b7909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_603422ea84029.pdfIn PDF document text
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/b197a091.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/online_shia_books_in_urdu.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/60694163031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_600dc05fd5afc.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/5e99a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/bus_ticket_booking_system_project.pdfIn PDF document text
    • http://pujumek.myartsonline.com/97008673706.pdfIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_8c7590dc8ee14acf8c9297aad9976ff0.pdf?index=trueIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_5ff9cbcb2e9540be8118c11988204abe.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_ff7cd31fa2ca430088188f253fab6142.pdf?index=trueIn 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_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 5872 bytes
SHA-256: fda494b54d813f4f1000e5005d0c908a6077bbbe186c67afa161380f8e84a7b2
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10584 bytes
SHA-256: 56e1814960c37ff452ef03be6d83781c17b349b888ca7198b45e7945f7b1802e