Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcb014e2dc3d26f…

MALICIOUS

PDF

86.9 KB Created: 2021-03-21 03:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b2dc8bafb93b245780cf17926838b638 SHA-1: 9c434c31916286fdd3672844cff19c782b0f6088 SHA-256: fbcb014e2dc3d26fc78a1d9b3a70b4de44e19374933eeccd1d9c0a67d6928665
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing multiple embedded URLs. One critical heuristic indicates it links to known malicious redirector infrastructure, specifically `https://crophysi.ru/strik?utm_term=star+trek+the+next+generation+season+1+episode+24`. The PDF also functions as a link farm, pointing to various disposable domains, suggesting an attempt to lure users to malicious sites for phishing or malware distribution. No scripts were extracted, but the presence of malicious links and the PDF structure strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=star+trek+the+next+generation+season+1+episode+24 In PDF document text
    • http://temppicture.xyz/rilitazujiteselonifegosuxuie7m.pdfIn PDF document text
    • http://fruittea.space/726190088597wmj1.pdfIn PDF document text
    • http://oficialshoes.site/915544043369ww7j.pdfIn PDF document text
    • http://kyukty68.xyz/physical_geology_laboratory_manual_a1ljdb.pdfIn PDF document text
    • http://pasendapp.online/la_metamorfosis_de_franz_kafka_capitulo_3d6uhj.pdfIn PDF document text
    • http://matroskin.space/914974307965wlr3.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/vizolamamuwugesa.pdfIn PDF document text
    • http://lesuxofozadize.mygamesonline.org/flight_simulator_2020_xbox_series_x_vs_pc.pdfIn PDF document text
    • http://instapodarok.site/center_radius_form_convertergb6n2.pdfIn PDF document text
    • http://zozamowewideno.mypressonline.com/angaraka_kavacham_in_telugu.pdfIn PDF document text
    • http://axecheat8.xyz/bofelalanaxuge7v82l.pdfIn PDF document text
    • http://xufonewujisos.scienceontheweb.net/lp_penyakit_pneumonia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senesijosezetu.myartsonline.com/vegan_diet_for_athletes.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/yalla_shoot_apk_android.pdfIn PDF document text
    • http://salajire.onlinewebshop.net/how_old_is_percy_in_the_last_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912b55f4-8c4b-442a-8515-ec7342def24b/tukugojeladafama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f51740ca-6f4d-4f3d-b29e-b9a3185ec462/letoxazibabasebegurixi.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/913889124.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/zokiwufalomebafurolepa.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/what_does_flipping_tires_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/38845690592.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_off0001138d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 5696 bytes
SHA-256: 74a94759d534a8534f72a578092776b407ef2ad6b7c33267ed42418e140ee3c2
font_01_sfnt_off000126f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 11016 bytes
SHA-256: c448ffb1638c709576f4d600c7c46cbd338e968e2d187ff37fa40e556f5ed965

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