Malicious PDF — malware analysis report

Static analysis result for SHA-256 1425467e63cfb44a…

MALICIOUS

PDF

78.0 KB Created: 2021-03-06 10:27:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6747e8af1469eec60b67ea33a2c56180 SHA-1: 6705b63233f08e925bd6569e01f83beca223f0aa SHA-256: 1425467e63cfb44a0e0e83b7ac60fd564776f2438c91fcc23b02e7f1b2fac1e5
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of external links, indicating it functions as a link farm, likely to distribute phishing content or manipulate search engine results. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=q+dia+es+feriado+en+noviembre+2019 PDF link annotation
    • https://cdn.sqhk.co/fekawifen/hchif4d/45859651864.pdfIn PDF document text
    • https://cdn.sqhk.co/watexoba/icijVjb/computer_notepad_notes.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/7470797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_600c19f8ab0e9.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_propose_a_case_study.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/ZhgyQgh/jordan_9_racer_blue_outfit.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/dslqCHJ/97853792850.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384308/normal_5fe503690cbd3.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/2448207.pdfIn PDF document text
    • http://vutisonoj.sportsontheweb.net/the_lord_of_the_rings_book_series_in_order.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/hjgiSjj/bixiwewipuwisotimajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5fed6767c949b.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/game_of_thrones_s8_download_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/d4icaYJ/jipev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_601f5c1516622.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/Fji3rjc/kiss_of_war_gameplay.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/b456011.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/ftd1bSP/voyage_des_mots_430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_e3924a1b98554e399be272ad8e3b5581.pdf?index=trueIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/the_metamorphosis_short_plot_summary.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_b1670914ffb24528adc007823ec623e6.pdf?index=trueIn PDF document text
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_3f59452e4b1b40178fa42a7ad381bd7d.pdf?index=trueIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_b8d53611699d426ca8c632cd6a3d71e4.pdf?index=trueIn PDF document text
    • http://nununad.myartsonline.com/54409936888.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_71981d9f257e41ce8ddaca4f74f2d756.pdf?index=trueIn 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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 5764 bytes
SHA-256: d0c0085561a1b481a8b8c3c2f47feb3be0430a2b73c0e2bf273bc88d19a68a29
font_01_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 11520 bytes
SHA-256: a1ea0f53244b2fec0f12e6360418afd2436435afad32977514594185cfebc2e2