Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb2374aadb71d28…

MALICIOUS

PDF

78.8 KB Created: 2021-03-30 06:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 21ffe12dc03502455ec5c3a6e759808d SHA-1: 034657d9f2d440de4b4c934fe36d1e74dba7f597 SHA-256: aeb2374aadb71d2886b9bd938c38589d626633698ca144921b2facea5a71d376
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://midufefew.ru/123?utm_term=canales+de+marketing+y+distribuci%25C3%25B3n+comercial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411231/normal_5fd6524d2ed10.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/e580409a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458417/normal_5fcaf6701e042.pdfIn PDF document text
    • http://nashremont.site/32705878972zww10.pdfIn PDF document text
    • https://kalokawagubur.weebly.com/uploads/1/3/1/3/131398574/gigixujulagisopi.pdfIn PDF document text
    • http://hayatevesigar.online/kogovujatimevewuralep5494.pdfIn PDF document text
    • http://ndfnasg.xyz/rt_news_live_stream_youtuben2bh2.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/is_captive_prince_lgbtsu7ui.pdfIn PDF document text
    • http://shop50off.info/garmin_oregon_650_vs_750486jb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_603d93d9ada10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393034/normal_5fd7d24cb141c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470678/normal_60614af343c68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gowobubovojot.epizy.com/ruwodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c14878-f71d-4d1e-b20f-63ac942b1ed9/duligal.pdfIn PDF document text
    • http://kenugaderagof.epizy.com/99489887994.pdfIn PDF document text
    • http://zerakunutage.epizy.com/20273353010.pdfIn PDF document text
    • http://dudaturid.rf.gd/94870476785.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/nawebalem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f683ff2b-7921-4199-a827-7b66201de4a4/how_to_draw_fun_stuff_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/18804034538.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_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 5820 bytes
SHA-256: b7509dfb5587adb0c361ab1d8b4d9701d1d857132be0cd739daadfbef2106509
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 12268 bytes
SHA-256: c7b1932dc258b204773909c6cc56998eb2d20c9e5cd422bc15769baaf138f879

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