Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c38d9e3c33ab01…

MALICIOUS

PDF

63.1 KB Created: 2021-02-10 18:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: a39ff8dd268c81fc09d1903a690bc05e SHA-1: 30568f26bfe4901def46ceabe75e4188a1278a5f SHA-256: 28c38d9e3c33ab013cede5344fcb877512b943472cee1d52489b775916273bc4
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and potentially malicious content, as indicated by the ML classifier and link farm heuristic. The presence of external URIs suggests an attempt to redirect the user to malicious websites, likely for phishing or malware delivery. No scripts were extracted from this sample, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/123?utm_term=eureka+airspeed+vacuum+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458124/normal_5fe52e1e41fad.pdfIn PDF document text
    • https://mepowubufavi.weebly.com/uploads/1/3/4/8/134858245/wozudaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_5ff681b6bf386.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/167223b63b116.pdfIn PDF document text
    • https://davabodijesofid.weebly.com/uploads/1/3/4/4/134474123/4339235.pdfIn PDF document text
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/lunagaxesosuzo_nuvob.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/2hjjb87/vr_real_feel_alien_blaster_app_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408479/normal_6022ccb9c2b31.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/2744968.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvifilezaja/wjhhd2q/samurai_mask_wallpaper_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/hdJghyu/42077086052.pdfIn PDF document text
    • https://cdn.sqhk.co/zesuxetirano/MZghfji/telehealth_by_simplepractice_patient_portal.pdfIn PDF document text
    • https://forerijekakifur.weebly.com/uploads/1/3/5/4/135401119/c18cf19d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tosememab.rf.gd/maths_worksheets_year_3_nz.pdfIn PDF document text
    • http://newubopuga.epizy.com/vapan.pdfIn PDF document text
    • http://petikeb.rf.gd/noguju.pdfIn PDF document text
    • http://tasefabomodewiv.epizy.com/28827023112.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_off0000b99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99D 5360 bytes
SHA-256: 640ac8b7381488fca4395166bf4de45793628ea9da6735a5c9d4cb8f38f7d137
font_01_sfnt_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 9972 bytes
SHA-256: 0fd17f8f739bf5a601535118aad032e587c6f051ae3cd2959b2f5dc0305be7ac