Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d15d685a8b9b3f…

MALICIOUS

PDF

73.1 KB Created: 2021-06-12 23:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 383e8e88c9c7d3c4ee64f48fac363866 SHA-1: ab02a8b7e20f9d3514c9fd2adfb3d1a5e9972c44 SHA-256: 39d15d685a8b9b3f43d6f6040a391b96d63ab0e2dd6dc265c8cb2d8b59933f9b
186 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. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://inwebjor.ru/pbw?utm_term=simulacra+and+simulation+book+pdf, is likely part of this scheme to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://inwebjor.ru/pbw?utm_term=simulacra+and+simulation+book+pdf PDF link annotation
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/pozepite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_603c8396a7e69.pdfIn PDF document text
    • https://mejodulifewu.weebly.com/uploads/1/3/4/5/134526208/lejalosafodepiseja.pdfIn PDF document text
    • https://xaweregosakub.weebly.com/uploads/1/3/1/4/131407668/polamugediwowo_fonuwarofupaj.pdfIn PDF document text
    • https://fowulovelop.weebly.com/uploads/1/3/4/4/134468794/xogopelumez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464078/normal_60199f7b1042b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_60c4f1c4e7203.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/xizegozuraz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144839463/givodavutasigagafalik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6442e5-7297-4915-a8bb-67a1dee3d3e8/fowokavirifek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f44bab-bca8-4a9b-b0b6-cdfe4c4737c0/usps_domestic_mail_rates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efbabbf8-5524-4d23-90ca-3cae44d7e542/50380463439.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b7c6de7-deba-4399-8d0d-023bb94337fa/62096544224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdfa062-82b9-49aa-945f-6260d961e5c5/kasinoxig.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/how_to_write_a_personal_statement_for_uni_nursing.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_off0000def6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF6 5608 bytes
SHA-256: ebca839a777b22e3a6acc7501ddc5648b75e8a14382abcf89f870bd3b71f2243
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 10968 bytes
SHA-256: 1de1114d8e94198e3b7c3e2182a5eac2a3b8f1df809ca9ca7fd1252889f67b8f

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