Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c4979cb9e3770b…

MALICIOUS

PDF

78.1 KB Created: 2021-04-03 00:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0f116cfbab5150c72473e78e8229da6b SHA-1: 5efb03cbab7d871ca1e6b8ca55d1367391acd7a2 SHA-256: 93c4979cb9e3770b622a3d398e22f72c30126753c7b6c4e73043ea4b47f8fac2
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are to benign-looking documents, but one primary link points to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link-farming or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the primary external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://zajinet.ru/strik?utm_term=como+validar+mi+titulo+de+ingeniero+en+estados+unidos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455657/normal_5fde4a64a1e53.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/envision_math_2._0_volume_1_grade_6_answer_key.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_605daab94b822.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/63195024040.pdfIn PDF document text
    • http://rabemedexisubis.mygamesonline.org/pavabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_606455575030c.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/appium_testing_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://59e5a08b-0d8d-455f-a3a7-35a3b781ab3e.filesusr.com/ugd/784815_bebac83094684406ac9b4d2931c0ba24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f6407b2-6fbc-4c67-9b30-a8012d91a203/64719782208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e293f8f-e192-4a65-a61b-18807a940715/where_is_the_filter_on_my_whirlpool_front_load_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/coloring_worksheet_for_toddlers.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/joker_and_harley_quinn_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/nesebunuxafadu.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_2a9dee7d879f425c8383bbc137fbce98.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_a83e95a139634c23a53ce58630fb8dcc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/66669994871.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_ccee145981314a23a0f88b258fc0ca4a.pdf?index=trueIn PDF document text
    • https://9afb1793-bc57-4514-bb46-74e980466609.filesusr.com/ugd/11f207_f0e1f11849a441ecb40d3ed21c8222d9.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_75539a58eb7444eca43b1577444f0754.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toguvaju/26781110170.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_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 5108 bytes
SHA-256: 0115581d045af91b694578c10df42996e73c049e5d347892c750ae6655c21a47
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 12500 bytes
SHA-256: 50a342895df0de4793f2cd9d8d75334b89acf79edc60cb87497869d1750b80d0

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