Malicious PDF — malware analysis report

Static analysis result for SHA-256 862ecd19affbfe67…

MALICIOUS

PDF

77.6 KB Created: 2021-03-17 15:57:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cd340eb4e5c91f39de28faf211ba08b2 SHA-1: 137aff0e2c76ffb08408b710745a386123e90141 SHA-256: 862ecd19affbfe6735963a6753ae37d8fdccf153d93acf26024c84d48e9b7add
186 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/wix?keyword=wii+console+instruction+manual PDF link annotation
    • https://cdn.sqhk.co/rivotoxupow/lgjhgmv/jirikobaxifizikanes.pdfIn PDF document text
    • https://cdn.sqhk.co/jedepazisu/jg7xgiG/29370113110.pdfIn PDF document text
    • http://dedekuwetom.iblogger.org/67688699876.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/VcjbPKI/azhage_azhage_album_song_lyrics.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/dozereno.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/jjc2gga/48409468666.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/VjcgcYK/translate_english_to_spanish_nice_job.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/dobulakumesizogeve.pdfIn PDF document text
    • http://livufuxe.epizy.com/pobidil.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/2052301581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d98cf19-bf18-43f7-bd7d-aa08b9c8d41a/detejubapadaraw.pdfIn PDF document text
    • http://sugebajofurite.rf.gd/saleduvubiwegi.pdfIn PDF document text
    • http://zobibeki.rf.gd/voxedekafozonap.pdfIn PDF document text
    • http://webinurerebalo.rf.gd/plc_programming_training_software_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f35695-b51c-4cac-93f0-52818e873fd6/85233829291.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_27bebec7031a4f26bee2da4e3793adb3.pdf?index=trueIn PDF document text
    • http://vapovefov.epizy.com/82742570758.pdfIn PDF document text
    • https://1cbf0fd9-62af-4102-a3dc-982f361539e7.filesusr.com/ugd/bfbc46_5344940dd03a4ef2844a2d213ce8cbf2.pdf?index=trueIn 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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 4960 bytes
SHA-256: e518075beecd199054bbd25154481fd394874a8959a4a9f2674969014da6a45c
font_01_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10924 bytes
SHA-256: 6e8d086fdee4e07dbf5114aa0f05679c053c1fa69a9acc14f404b9e8f5619608

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