Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ec38e0c42fc02e…

MALICIOUS

PDF

69.9 KB Created: 2021-06-02 12:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 687267eb8e9efec9d23958f05f68e474 SHA-1: 68216732c3b0ff015ac5bbdc8a05e3df0c894f9c SHA-256: c7ec38e0c42fc02e60303d36b2a21d2e406e9813223ccad5b224b44aa1013355
194 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button lure and the ML classifier's high confidence score further indicate a malicious intent to trick users into downloading unwanted files. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/pbw?utm_term=download+google+translate+for+iphone+5 PDF link annotation
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/fudibejukuxep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_6063dbb6589fa.pdfIn PDF document text
    • https://sokevabo.weebly.com/uploads/1/3/4/6/134665749/3683843.pdfIn PDF document text
    • https://bolefapazudakaj.weebly.com/uploads/1/3/4/4/134478960/nuwuropalul-bidez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_6030087aca1ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478131/normal_6037bee163034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403820/normal_5fd9c729c799e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_6019045d8fac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_60201baa3b78f.pdfIn PDF document text
    • https://kamabaxi.weebly.com/uploads/1/3/4/6/134650964/vupodebijebamo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nilanom.pbworks.com/f/mokabotinamevenowalilap.pdfIn PDF document text
    • http://gifavipa.pbworks.com/f/18933061754.pdfIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144425874/defawafapovukakuzolunulup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bc3eb1-fa5d-47d9-aad2-97323075a670/rujuxosomobosewodaga.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144416181/cover_letter_for_job_vacancy_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d08db8d-b499-4c5c-9831-6b688185a5d6/how_to_bitcoin_on_cash_app.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144443664/nejifilejipudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbdc903-5fd8-4f0d-9176-c6a3625e3c76/wabidimivak.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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 5516 bytes
SHA-256: 5c6378827c59fa4e8c4ed52d00b8289de030b111ed2234b1ddec2f1b7e74ec38
font_01_sfnt_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 10760 bytes
SHA-256: 4bd14e549ca5e513359719848eea3137984e103f070b9dfe5ce2dbacdb6bb1f0