Malicious PDF — malware analysis report

Static analysis result for SHA-256 b416ac558af40ee3…

MALICIOUS

PDF

82.8 KB Created: 2021-03-31 10:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c1add136a7a358303e3ac110b248e9f4 SHA-1: aaa8f26cbe2217eded25bc71b3be200d2597e620 SHA-256: b416ac558af40ee3cc6f04e9ab02b56e820b934d60ad11d72b8977b4e3aed1ac
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malware or phish users. The embedded URL 'https://dafemum.ru/123?utm_term=pdf+evangelismo+con+fuego' is particularly suspicious and likely leads to a malicious site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=pdf+evangelismo+con+fuego In PDF document text
    • https://doruxajowivabog.weebly.com/uploads/1/3/4/8/134870444/fusivejujamovo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_605fa9ae3595d.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/jenudivofib_fivotaf_wabimabaxojiget_pepudiruj.pdfIn PDF document text
    • https://nitetawowi.weebly.com/uploads/1/3/5/3/135301411/patojunamijid.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/236810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_600c803a13860.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/6396709.pdfIn PDF document text
    • https://vepimogarib.weebly.com/uploads/1/3/4/8/134856589/a5b6dd.pdfIn PDF document text
    • https://cdn.sqhk.co/kezinujus/0wdlich/does_fastmed_have_rapid_covid_testing.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/k2zjiyp/ombre_nails_pink_and_white_short.pdfIn PDF document text
    • https://cdn.sqhk.co/tazarufavixa/ohgT318/photo_collage_studio_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370764/normal_6000e86f3ace6.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/082819bdd6e68.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/wavupufetane_pojozitominef_fedifisanaxibes.pdfIn PDF document text
    • https://wofofubuw.weebly.com/uploads/1/3/2/7/132710679/mijolomom-sopotakevaz.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/20a7f092-ee49-4ca1-b5da-e69b6b39e503/what_are_the_three_main_types_of_business_activity_give_examples_of_each_activity.pdfIn PDF document text
    • https://058da8ce-bb30-4b8c-81eb-8903018cac65.filesusr.com/ugd/ab745b_ef2154cddc9b4d49811c9134b83874e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d116e29c-a900-41af-ba8a-eb66f4568cfa/the_natural_novel_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6097310b-bcac-4046-a93b-0a9dcddfa89a/54661928953.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_700011ad0b644e728a314c38eb28a276.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_077a79d262484075a8b756b3881b27bc.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_off0000fea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 5304 bytes
SHA-256: a4cd099be09d175751dfcbd600ac66564821c2f0c5e014f910532be7718286e8
font_01_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 14212 bytes
SHA-256: d9d6d3b7c9c9cb6b3e57be4f5d4185891debab85b5875f15b82f8cc4d59b9906