Malicious PDF — malware analysis report

Static analysis result for SHA-256 5845d8fe2080e0f7…

MALICIOUS

PDF

91.8 KB Created: 2021-03-07 00:25:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 723bb8f2dcfbfd7304e9c4989592b933 SHA-1: da7218698a426b2eb653c253110fc0eecef1634a SHA-256: 5845d8fe2080e0f7b4ef909689cb4ecf077110f5accd46b0b6abb2f3fd3e33cb
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or scams. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=how+to+fix+tension+on+viking+sewing+machine PDF link annotation
    • https://kusopexel.weebly.com/uploads/1/3/4/5/134526262/vogaxumol_vanozajed.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/dujedegabukim_sikekadilulosa_vaxukiwipirixop_ruvoxofixufun.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/diferencia_de_comunicacion_animal_y_lenguaje_humano.pdfIn PDF document text
    • https://fikobovivinuzo.weebly.com/uploads/1/3/0/7/130739062/zazel.pdfIn PDF document text
    • http://kekijojovif.sportsontheweb.net/36621686184.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwapoguxuwuzir.epizy.com/how_to_reset_maintenance_box_epson_l6160.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_5630429bbe994df89b0799cc0c69f351.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed05f534-f6a7-4d5b-ada2-728c5e4923b0/nutinitamewunatibulidugam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5497e688-6a7b-441f-bb35-ec40c26f9aa2/fixofipakoxewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024e819d-f531-421b-a19b-2b1f9a6bf2f3/64791388394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fd93b1-2267-416e-a6da-7ebc9a6d3fbc/fikudiketasepubefu.pdfIn PDF document text
    • http://bimemelal.epizy.com/corel_draw_x5_tools_tutorial.pdfIn PDF document text
    • http://wetowotupime.rf.gd/absolutely_free_rental_agreement_forms.pdfIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_8cf6cd57a730483c881f0f5e578715b5.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_695610284b7847b6b246ea8609568f7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b638f26e-a918-47c9-9e5a-ab4f8975a7a5/lg_120hz_refresh_rate.pdfIn PDF document text
    • http://vigevelo.rf.gd/casio_fx_991_es_plus_user_manual.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_f6a29b5a443b4bcfac34539bb0081b38.pdf?index=trueIn PDF document text
    • http://vujiwexamofone.rf.gd/harvest_festival_guide_acnl.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_7853d36225bb491c9e1f5f28d7d98ddb.pdf?index=trueIn PDF document text
    • http://jiwunix.epizy.com/32619832354.pdfIn PDF document text
    • http://rovetenexosa.rf.gd/33479842494.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_off000128c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C7 5412 bytes
SHA-256: 7e3aedfcf996547277c6b9e1c689bba208533018e116ede85306e75b74565de7
font_01_sfnt_off00013b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 11596 bytes
SHA-256: c4f62e5b3ee3a0aaa4e93faae5898e993598a6f53a540c29f983a5c81454f104