Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c5359135939f68…

MALICIOUS

PDF

76.5 KB Created: 2021-06-08 20:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1560239cc090350cfbbdf5404d18fbc2 SHA-1: f3bbef1bb6e386dcefa522c24c08c827ebeae1ba SHA-256: 19c5359135939f6880725e1539c2f2f9c3650f134894a35990afd436de627d46
226 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://pistant.ru/pbw?utm_term=new+version+among+us+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417306/normal_60178053ad2b2.pdfIn PDF document text
    • https://posexabilibo.weebly.com/uploads/1/3/4/3/134350455/926e6fb3b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459628/normal_6007c3d805382.pdfIn PDF document text
    • https://ziganuridu.weebly.com/uploads/1/3/0/8/130815115/8293932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_6038df0078ca6.pdfIn PDF document text
    • https://mubagaluzab.weebly.com/uploads/1/3/4/8/134874300/wunex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_6037749d38af6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/253e32b2-c4e9-464b-8025-7147219165a1/12v_side_by_side_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c3daa5-d05f-4347-b5a6-3230b92c6bbe/tonazerafiwinunuwisoxebi.pdfIn PDF document text
    • http://junerew.pbworks.com/f/fraction_word_problems_worksheet.pdfIn PDF document text
    • http://gomedaj.pbworks.com/w/file/fetch/144560154/film_cowboy_subtitle_indonesia_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787568db-9e3b-4768-b330-6c1ea91b120c/2006_honda_crv_manual_transmission_fluid_change.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/99574349334.pdfIn PDF document text
    • http://ropotupi.pbworks.com/f/corel_draw_x7_full_portable_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d0eeff-d4c8-413e-9c28-c163a78eb2ec/muzoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92b20ba-c106-4f03-a556-55492ad6e9c9/what_does_a_safety_engineer_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/346b34ec-3186-48f2-b761-9542b4362fb4/33609350381.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436271f7-fa16-40aa-a3d0-7057537a736b/descargar_gratis_libro_la_busqueda_de_dios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16cb5c6-7f16-486d-8908-8c6bec211825/speedway_series_125_amp_flux_welder_parts.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/2246436146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a7d0bc-4812-4490-9252-d046d02ee69b/67189585715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb52265-5daa-4345-8d74-c56267c341c7/mekaxusojuvix.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_off0000eb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB88 5340 bytes
SHA-256: fa4ff49f1a765fac3a2067569eb800466a12be9b375134e1f7c12c71a27addf8
font_01_sfnt_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 11352 bytes
SHA-256: bca87857c6fbd0c596f3113b8cb4d9da6b751dc8962cff409e61a4bb5e6c0ef4