Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d21d88981d6ac4f…

MALICIOUS

PDF

86.8 KB Created: 2021-04-09 08:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 103259de9a410049c69d5abd667fdac3 SHA-1: f68e26d0511917335dcabb73ca9c1e3384f927d1 SHA-256: 8d21d88981d6ac4ff406f7f7dd0e9bd9d76fa91d00c67d4dbb7e2b286388438f
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 acting as a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/strik?utm_term=vizio+sound+bar+manual+sb2820n-e0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408323/normal_602a6b9885b69.pdfIn PDF document text
    • http://bikizugupaka.iblogger.org/autocad_learn_book.pdfIn PDF document text
    • http://minipipazenome.iblogger.org/85320550914.pdfIn PDF document text
    • http://dujaliz.iblogger.org/arthrosis_deformans_synonym.pdfIn PDF document text
    • https://suveruwifofe.weebly.com/uploads/1/3/1/3/131380558/zuzofenulexin.pdfIn PDF document text
    • https://pidedofafotego.weebly.com/uploads/1/3/1/4/131438241/a03ed94db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_6014cddf91d87.pdfIn PDF document text
    • https://jorikune.weebly.com/uploads/1/3/4/3/134371696/zejefowida.pdfIn PDF document text
    • https://mojapilujo.weebly.com/uploads/1/3/0/9/130969316/9391039.pdfIn PDF document text
    • http://kuxixel.iblogger.org/69375372386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_601042d0206f4.pdfIn PDF document text
    • https://rolejiminuvaw.weebly.com/uploads/1/3/2/7/132740194/kovijevavopur_sukebi_topip.pdfIn PDF document text
    • http://xumimoz.22web.org/cadmio_en_el_cacao.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_602eb8ff67e2b.pdfIn PDF document text
    • https://kazenoti.weebly.com/uploads/1/3/2/7/132740362/sabiv.pdfIn PDF document text
    • https://vamugibamapiju.weebly.com/uploads/1/3/4/5/134588186/besifodepa.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/8282527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_5fd9318191be8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462986/normal_5ff0375432a21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab0e87da-b7e0-4c33-9f15-905bb1bcc7e6/50496501237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154795c1-6881-48a3-88b1-df723e7bb590/toyota_camry_hybrid_2019_price_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e91a122-50c1-4375-b072-e5a8f52e719d/volume_element_in_spherical_polar_coordinates_is_given_by.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0a49f9b-e80f-4678-b4e3-750e4da57a4f/how_to_reverse_search_an_image_on_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6558ddb9-da87-46da-8a2b-924ff8e02834/mitologia_dioses_griegos_y_romanos.wmv.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_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 5628 bytes
SHA-256: da0f8b52ef083e4c64c584fe86aeacf594cdc06c2b89d6affd640692ebf80e7d
font_01_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 12700 bytes
SHA-256: 809b0b247ae61857c7f5789fd2e063c1ce71fb6b3626e50a97a9258b65f1d902