Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb1110d59f6b233…

MALICIOUS

PDF

93.1 KB Created: 2021-03-01 20:55:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8bfc1e13eb0d72409a199d59d1869b84 SHA-1: a342fd734791d701b60b11a95f88762a0b3bdf2f SHA-256: cbb1110d59f6b233b4dcc3d0b3ba5e032d609933e4906d92f05e93247407c1a7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=las+vegas+dance+explosion+2020 PDF link annotation
    • https://cdn.sqhk.co/pagozixupezi/gc2QhbF/94964562255.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378604/normal_5ff64e262432e.pdfIn PDF document text
    • https://cdn.sqhk.co/pepegizeso/DFoLgiN/lynx_grill_for_sale_craigslist.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/gjjf1RI/school_days_spike_lee_full_movie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414164/normal_5fff9af197ff7.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/pifibej_ropesofogu_vepafevibob.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/b8id6id/3d_rescue_puzzles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489733/normal_600dcd0bd505c.pdfIn PDF document text
    • https://fovinerorowabas.weebly.com/uploads/1/3/2/6/132682717/linegepu-bipowugonedum-nukurosedodos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://towewewavagefem.rf.gd/luna_lunera_cascabelera_cancion_original.pdfIn PDF document text
    • http://roxubimolileko.epizy.com/the_pact_book_jodi_picoult_summary.pdfIn PDF document text
    • http://pakatikik.epizy.com/diwufuwaf.pdfIn PDF document text
    • http://bajivuselome.epizy.com/rokeg.pdfIn PDF document text
    • http://tawexega.epizy.com/waze_android_auto_non_funziona.pdfIn PDF document text
    • http://kadimupekomo.rf.gd/geico_car_insurance_accident_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12461 5196 bytes
SHA-256: 08351776420993a4bb20e55d803c79a820eea858c10f92ca101d0e35c66aed24
font_01_sfnt_off0001361b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361B 10240 bytes
SHA-256: 7f9661dcfd2a17dfcc4d79b1c4da2c1bf72fff779f8e77c0b01a2fbc246a7e5a
font_02_sfnt_off0001593e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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