Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cda55c2fbb88bb…

MALICIOUS

PDF

71.5 KB Created: 2021-03-12 14:16:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 85ef3ac4b510a2c164bae81f981c6ef6 SHA-1: 23f656d8a91ece153ce6dfca7b66b9f969aa486a SHA-256: 55cda55c2fbb88bbed2133f892e9284e22de3e2b2dbaf9e7377cbfb09307611f
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 malicious intent. The document body, though heavily obfuscated, suggests a lure related to PDF conversion tools. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or malware distribution scheme. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://jottigo.ru/award?keyword=pdf+to+word+converter+download+online PDF link annotation
    • http://vawurabel.mygamesonline.org/23762761533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461763/normal_60484eb1c8a0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420019/normal_5fc834b6039e1.pdfIn PDF document text
    • http://sowipilarow.mygamesonline.org/murozezodusolojowefuleti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415524/normal_6009f9fab3c13.pdfIn PDF document text
    • http://winsbig.space/dudikijai03xr.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/33263853496.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/affairscloud_september_2020_weekly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_60379decb2325.pdfIn PDF document text
    • http://blockingscenery.com/juberednt11s.pdfIn PDF document text
    • http://sazulido.medianewsonline.com/47279639135.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/85011526029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5fcdd6ae8bd3a.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/international_journal_of_research_and_analytical_reviews_indexing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kadebenatoloxib.rf.gd/keynote_presentation_templates_free.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/soxozorugeladikulaxu.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_b301ab72636e418f98f5963101e8dbcf.pdf?index=trueIn PDF document text
    • http://nukilaba.myartsonline.com/jijakunivugufexasi.pdfIn PDF document text
    • http://vazenapidogavi.rf.gd/90683594051.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_d20dc85e43084193a42b3636082792ce.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_2524f99330264cd180cfd9f8de3856ec.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f88b004bcf59447f8a427929c45ea4f4.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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 4992 bytes
SHA-256: 0ddea21a0580cef6ef8f45069bc42ce05a548024862241e57649fe40c4cc600b
font_01_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 10444 bytes
SHA-256: a7cd876cb431f4927d868647cb582a7e4aa9ecdbda1046d66e9051aadc4497ba

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