Malicious PDF — malware analysis report

Static analysis result for SHA-256 89248f76df306764…

MALICIOUS

PDF

84.9 KB Created: 2021-03-27 11:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 40cf40c46abc22d53594f7f1149407ab SHA-1: a82e6c3de43896ef0304d5f0ae9a3a15c59e5b38 SHA-256: 89248f76df306764fbad98cd40eb6489fdcf4f787e6769a39d726e756b038480
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various websites, likely for SEO manipulation or to distribute further malware. The presence of multiple external links suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=bubble+trouble+2+apk PDF link annotation
    • http://grantmedica.ru/grand_theft_auto_5_android_mod_apks4lx5.pdfIn PDF document text
    • https://cdn.sqhk.co/nunemiziku/X1afgdG/world_craft_crafting_and_building_city_simulator.pdfIn PDF document text
    • https://zixafozete.weebly.com/uploads/1/3/5/3/135349102/pasixorabas.pdfIn PDF document text
    • http://kivimuxalusis.22web.org/digital_photography_ebooks_free.pdfIn PDF document text
    • https://revapukas.weebly.com/uploads/1/3/5/3/135323612/5bb1271a3d15.pdfIn PDF document text
    • https://fipuwetula.weebly.com/uploads/1/3/3/9/133997959/b630d1d1.pdfIn PDF document text
    • https://cdn.sqhk.co/fowijuseziju/8hhKXw5/2d_shooter_browser_games.pdfIn PDF document text
    • https://duwizule.weebly.com/uploads/1/3/4/6/134663296/8853883.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/fuledezodojipa-wukul-pudamoladilo.pdfIn PDF document text
    • http://arfesopt.com/securities_analysis_benjamin_grahams21i0.pdfIn PDF document text
    • https://naforuzutexas.weebly.com/uploads/1/3/1/4/131438024/metarobem_virizemomuz.pdfIn PDF document text
    • https://zugipevewepa.weebly.com/uploads/1/3/1/4/131483317/vasotugapodolilog.pdfIn PDF document text
    • http://power-guard.shop/325067909104j72z.pdfIn PDF document text
    • http://civiliscmq.online/mulafifoxonupojudopfalx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_3087d7578f8b4d7cb215885645a09446.pdf?index=trueIn PDF document text
    • http://mawekipabotore.epizy.com/tedemipures.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_9a9be252ce834f5cad6193a402e889d3.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_8168832e0bdd490296e99808e063bf43.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_ec820d48fa854e1185dbee9beda27dbb.pdf?index=trueIn PDF document text
    • http://vubenotabajumem.epizy.com/rizoxoje.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011144.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11144 29740 bytes
SHA-256: 4c0c1d1e5721f93de3c581be5ffca4fef5d59660adaa8474f285994814d29815
font_00_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 5020 bytes
SHA-256: cd107ac8f3339b6bb491d80b8cdfd2b2555d384c07ed251b9c6d54bc6860ed8c
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 10356 bytes
SHA-256: 6082fa2020a708aff13e3748c4b4e63b58213da45b4a73dd59584dbe7c8780d4