Malicious PDF — malware analysis report

Static analysis result for SHA-256 a484455fb67fc7e8…

MALICIOUS

PDF

75.5 KB Created: 2021-05-14 23:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 89f89c59a5bc014bde805e04b6a00b70 SHA-1: a89c17e2f9209aad02d3e29e0695a2c72bc8aa84 SHA-256: a484455fb67fc7e8d840ee400ece20360f9fa040f9abb698822645b5c594bdfe
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, strongly suggests a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The primary attack vector appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=what+mos+is+navy+seal PDF link annotation
    • http://figimumagoko.mygamesonline.org/que_es_employer_branding.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_605f7de95dc44.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/11215396792.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5fe5757448a10.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/j5Oiegc/cartoon_comedy_video_download_mp3.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/zizajejiwerorisedejejupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_60507efe6983a.pdfIn PDF document text
    • https://cdn.sqhk.co/wemigiwim/heuidid/xiwelaxuvovogadajututofu.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/remixasomupidabu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500904/normal_5fe09b6b047a6.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/bizuveruvotaduxad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejegaba.atwebpages.com/coordination_chemistry_bonding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07e395d7-6738-4cba-a0c1-b06d97e03b7f/different_types_of_clothes_materials.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/27692760827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d07572-01a9-4298-bfd4-763277cb3cbb/37031991400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32cd015-7cb4-4638-bb09-c7a9ce9807f2/garalejalovirof.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/16838533048.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/20336449351.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_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 5004 bytes
SHA-256: 835d5a8ac0a0f4a2b58c6128de7a7764577827b5ade04262ae0858606858d2e6
font_01_sfnt_off0000fba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA5 10960 bytes
SHA-256: 0a7641446b5b7c4a9417a72e3ee84d0d6d0b3e16412bcca340482d1d7962d405

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