Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae6f6545c4e5208…

MALICIOUS

PDF

77.9 KB Created: 2021-05-05 13:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b5ddeca9d670a949e8d6c89437e94ae0 SHA-1: 92bb949186894e047d9da0fde6798012df38ab26 SHA-256: 7ae6f6545c4e520881eb8476a023dbc351c4eef139fb808d82cdea2244062865
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, suggesting a phishing or malware distribution scheme. The presence of the 'utm_term' parameter in one URL, set to 'visual basic programming code examples', indicates a lure to attract users searching for programming resources.

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 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/strik?utm_term=visual+basic+programming+code+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388614/normal_601059d1df6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379614/normal_60354c4840c5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491669/normal_5fd1d19f4c9eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376875/normal_6009aad6c0b5d.pdfIn PDF document text
    • http://jibesikore.iblogger.org/bacilos_gram_positivos_en_orina.pdfIn PDF document text
    • http://zosoxefu.22web.org/36237880034.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/7944959573.pdfIn PDF document text
    • http://wodekenizowa.getenjoyment.net/what_is_capped_brood_bees.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/bozopupupusisa.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/xegogusavekem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489245/normal_600da76cb7fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fdbd3c56eb91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491164/normal_5fd36d3a982bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424689/normal_5ffe1582dcc14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410983/normal_5fdc99bce1298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411916/normal_603844c6e64ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e846ae64-f93e-41bd-baa4-bda35b147f36/fekudevamexi.pdfIn PDF document text
    • http://juwelaloz.epizy.com/basic_tactics_for_listening_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dedfe62-1e64-4301-a379-b7f9d35a13f1/2006_bmw_330i_insurance_cost.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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 5564 bytes
SHA-256: 58e3c215bd87a98266a194e3237f180f6ab9cf9a762fa8b5b51978a05a376954
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 11308 bytes
SHA-256: 79366c83746dba6934653bb0e7876745f235680bbcb8ec29b20b9cfadb1bb9c9

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