Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ae4561e5e6cc20…

MALICIOUS

PDF

76.5 KB Created: 2021-03-01 20:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4e52a2f8114962b546ddef0d1c5c702f SHA-1: bc3f218e6259bbb2a28c8563cece19a4ebeb6f14 SHA-256: e0ae4561e5e6cc207e6851218aa85c42b9e5498c278dbe397c1d747b4bcbbc5d
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and numerous external URIs point towards an attempt to exploit users by redirecting them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=clockwork+prince+cassandra+clare+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428054/normal_603c6220919fe.pdfIn PDF document text
    • https://guzokilib.weebly.com/uploads/1/3/2/7/132741743/zedeteved.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/70312660470.pdfIn PDF document text
    • https://jonaditogun.weebly.com/uploads/1/3/1/4/131408899/96f88e4683.pdfIn PDF document text
    • https://farenutatovepo.weebly.com/uploads/1/3/4/5/134502273/2b928a964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_602c3aed44f74.pdfIn PDF document text
    • https://bugajujifupub.weebly.com/uploads/1/3/4/8/134894919/9114056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_6005397133d83.pdfIn PDF document text
    • https://befunopokoxa.weebly.com/uploads/1/3/5/3/135327779/9803374.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/fixanafuwudoro.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/84240091350.pdfIn PDF document text
    • https://tizomejina.weebly.com/uploads/1/3/3/9/133997236/wekowusu.pdfIn PDF document text
    • https://sinepakeje.weebly.com/uploads/1/3/4/4/134490574/9724368.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_60065b69470a6.pdfIn PDF document text
    • https://wiguvebilef.weebly.com/uploads/1/3/5/3/135389097/falolowajex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479212/normal_5fe45caf1c8ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497109/normal_5fd832dfad43b.pdfIn PDF document text
    • https://tanatomunedasov.weebly.com/uploads/1/3/5/3/135325499/ef0e9d.pdfIn PDF document text
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/pazapotutaw.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/fb5ccff455c30c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fe68c6c23824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://newemepakirid.myartsonline.com/what_do_you_need_to_know_for_medical_billing_and_coding.pdfIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/kidde_nighthawk_carbon_monoxide_alarm_manual_kn-cob-b-ls.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_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 5384 bytes
SHA-256: b9a206653a4ccc45c2b51caf9dadee387d5c72a104bdee922a29777bfbcf220a
font_01_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 10300 bytes
SHA-256: 0c86db8b5ffd9631edbf6177054056ba0c6a2adfd05387bc12bc70a2f5ad3864