Malicious PDF — malware analysis report

Static analysis result for SHA-256 603f1ce84e4e400b…

MALICIOUS

PDF

93.1 KB Created: 2021-04-05 05:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e71c8c88681e4d72f6e561a0c768883e SHA-1: 54195c22992b5b4c40187fab99ae978b2bd3b0d1 SHA-256: 603f1ce84e4e400b9b027eaf8d5a19ff8348c80c0fc6c00d55f0affaddffe970
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=warriors+sunrise+ragnarok+mobile PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485309/normal_600c095c33d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_6047952ec8f4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457881/normal_6008d296c4302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_600e612f87b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_603a70c4ece4a.pdfIn PDF document text
    • http://japamawosoj.mygamesonline.org/25589720640.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/how_many_nuclear_power_plants_have_been_shut_down_in_the_us.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pipizupife.epizy.com/34170837695.pdfIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_cdf2457882d440adb43b20382b0ccdab.pdf?index=trueIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_75e21533dbd14e1ca3b94b9a38d14c91.pdf?index=trueIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/rational_numbers_operations_worksheet.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_f8c3e9624e734c8c8493f84ab605dbd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe23ecab-0183-4723-825a-34c74bc861e0/63355777576.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_dfb243a593b042c8aa206a7388b5bb7e.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_a24a693d93ae42ffa1f63c33f574b30b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e114ba8c-f664-4d36-875d-106c7ed5f1f4/what_is_data_management_definition.pdfIn PDF document text
    • https://c22e5cf4-338a-4003-9cad-c1cb0be29285.filesusr.com/ugd/3db607_62b513b20bc34b3f8722f462a5f3d7c5.pdf?index=trueIn PDF document text
    • http://vodukipezep.rf.gd/carcinoma_cervical.pdfIn PDF document text
    • http://pezexer.rf.gd/slavery_in_africa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5F 10252 bytes
SHA-256: 4c9900439eec9521d15f1f056448a663524faba8f3867d26634800f96f340d97
font_01_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 5024 bytes
SHA-256: 637fad064f73b33b53dfe85196a50977125be9539f86373a64901f1f1faf7d0e
font_02_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 11148 bytes
SHA-256: 46e4a7027bef27eb8d42b75075243145aec908f2020a4435888296cbffdfbfcb
font_03_sfnt_off00014368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14368 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d
font_04_sfnt_off00015800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15800 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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