Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56746708eda0be9…

MALICIOUS

PDF

77.4 KB Created: 2021-04-29 12:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ce45e8713ce5509b92797e6997f9445b SHA-1: bbc4e15c96e5b8b62e1c27b0e2759564bf66fc01 SHA-256: a56746708eda0be92b893db9530dcadeaa1aaa3fbd926c24877d20bbbb1b78d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://resalured.ru/strik?utm_term=tabla+de+equivalencias+de+gramos+a+kilogramos PDF link annotation
    • http://sevezor.scienceontheweb.net/how_long_for_baby_to_get_in_deep_sleep.pdfIn PDF document text
    • http://albatros-trans.ru/cinema_paradiso_sheet_music_string_quartet1gv6u.pdfIn PDF document text
    • http://vinnipoh.fun/ludulewowopiluxujuwogac6xb5.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/xudesubuvupazagef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodegodonirad.atwebpages.com/how_to_solve_box_and_whisker_plot_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0388d549-dc3a-4498-ad68-6bb4a9eb05b8/codigo_de_activacion_de_windows_7.pdfIn PDF document text
    • http://pimimozoji.myartsonline.com/fizalov.pdfIn PDF document text
    • http://tofalit.myartsonline.com/kuzenin.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_9ec0338f67304584a628b30b103ac832.pdf?index=trueIn PDF document text
    • http://jifisuxevizek.myartsonline.com/32615350672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42efcffb-0120-4b3c-b253-ce9361b724ce/denon_7.2_av-receiver_avr-x3200w.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_1e7317f3b72c4d0aafaa6f97d57dbc5c.pdf?index=trueIn PDF document text
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_e1108c42609544a182265c07447cc145.pdf?index=trueIn PDF document text
    • https://1923692e-f727-4f58-80a8-3583160180e3.filesusr.com/ugd/c4ccc4_4036895233f241ad96bf0dd622204d65.pdf?index=trueIn PDF document text
    • https://dd6f0c70-611b-430f-b219-ee0593fd0e1f.filesusr.com/ugd/d60051_c72433068fa34870ae2b4494452a597b.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_051167a5a2c941049e621532bf477c5e.pdf?index=trueIn PDF document text
    • https://d650f791-4ca6-4964-96f1-ba9fac0414c1.filesusr.com/ugd/adf9cb_b5ab81774d9843e9967a7677afb12886.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b15c6bf-83a3-448c-b4fe-eb825d30dfdd/52834474263.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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5600 bytes
SHA-256: 67c5fcc66ca048fe31c34c3dbca4d7f8cac28d8586e3c0c89c97d7adf3ed9638
font_01_sfnt_off0000ff9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9B 12004 bytes
SHA-256: 172504aa89f3718b0218aba2d9512231734af4fb0f9ec2a21f8a46ae86e9d8d7

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