Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3060d58cd714c1d…

MALICIOUS

PDF

76.2 KB Created: 2021-03-14 04:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e9a838c906c68deaceaf1ed71f453ce1 SHA-1: 0572539ff65e775014711d0bfbddf6071b019053 SHA-256: d3060d58cd714c1d3095c2b7e1f10db658941130c44925691ded595d8675a350
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it is part of an SEO link farm designed to drive traffic to various websites. The heuristic firings, particularly 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly suggest this malicious intent. The presence of URLs like http://opsnatur.fun/preparation_of_acetanilide_from_anilpp621.pdf and https://vilenefex.ru/123?utm_term=cantabile+voice+class+pdf, combined with the ML classifier and ClamAV detection, confirms its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/123?utm_term=cantabile+voice+class+pdf PDF link annotation
    • http://opsnatur.fun/preparation_of_acetanilide_from_anilpp621.pdfIn PDF document text
    • http://experiment.website/how_to_become_a_fearless_speakerxz5k4.pdfIn PDF document text
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/dipibetemupanin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60183f82dd7d0.pdfIn PDF document text
    • https://gidorimafemona.weebly.com/uploads/1/3/4/8/134867851/9658389.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/13bb3531bb91.pdfIn PDF document text
    • http://testvvd.xyz/english_adjectives_prepositions_exercises2ftle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5ff5cd69f3d4e.pdfIn PDF document text
    • http://hairsprof.ru/how_do_you_write_a_sponsorship_for_a_racing_proposalgyuio.pdfIn PDF document text
    • http://topplafond.xyz/check_your_computer_specs_windows_79zaoa.pdfIn PDF document text
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/saxesunekos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_6035ab6a02ce9.pdfIn PDF document text
    • https://tebojizo.weebly.com/uploads/1/3/1/4/131406069/jumexeberituxi_sifokiwig.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/gopigit.pdfIn PDF document text
    • http://denizan.com/sisusuwoforag91m5f.pdfIn PDF document text
    • http://zerkalo-fugicar.website/paisseur_de_trait_autocadwzzks.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_d25a87af3ed246a28fcac8b3c7744c83.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_94d94a25329c498599a9a2942cf2d5d5.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_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 5160 bytes
SHA-256: bd6d0aabbe5a92a6f02ca314a5bc7fe942e979df9cb6d67dbc8f821a1aab4945
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 11336 bytes
SHA-256: d63d7876768057afcd99b2015174e745e0cc7604f97867928f4299bf9e8bc724

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