Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b0c30131e313b2…

MALICIOUS

PDF

86.5 KB Created: 2021-03-21 11:27:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 135e79a185b7cafd7c7d67fc2a47b66d SHA-1: 33623a4bb782993219d66a35154b0ae19cca7eda SHA-256: 49b0c30131e313b20d14a35990263051c6e99de55a4fd1202c80e4a4109f808c
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious phishing content. It contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to exploit user curiosity or trust for malicious purposes.

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://midufefew.ru/strik?utm_term=what+does+human+condition+mean+in+music PDF link annotation
    • https://judetali.weebly.com/uploads/1/3/4/7/134723341/bediredas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_601de4a9c6d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476943/normal_602cf744aab3c.pdfIn PDF document text
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/6d59eab00854ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469631/normal_6001c49ce7b94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495058/normal_5ff65dccb3ea9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_6026b30bd58f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_60340850a1675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_2342b3e7a0d1444d8b52a8caf7090946.pdf?index=trueIn PDF document text
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_48c20ac5cc9b459c97728ca04098ec5b.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_15b5cd2287fa441ab03e5673f107a833.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_f03e83627bff480ea12ae2ef1f6a1004.pdf?index=trueIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_bade8c5a4fee4f0a90b3e13165398f2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3507c573-dd93-41a7-a742-6ff171ed0a13/21461724299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e51c009c-8bb3-4d6d-b051-b9eaf93105eb/21104765614.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_f86162d7d5584d02891073c2ec33b02d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7f4873-2e93-4d96-a5ea-80fa5f251ada/was_shakespeares_macbeth_a_real_person.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/634e7416-560b-488a-bbd6-82ec984f7bcd/56693137020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb1dd7c7-29c7-4236-be69-8eab07ebbfce/lasokoxew.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_62c7305874604c6390d5574f0ea0d8a6.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_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 5064 bytes
SHA-256: 7ab25949a1f0d88e14f33e1f2739089c8280f6af50c22845b00452bab2640a56
font_01_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 11228 bytes
SHA-256: 7be70dbc241b0dd5a20350eaf34d9f48d0c8816ab7072c3231f1a9559c07d8f8