Malicious PDF — malware analysis report

Static analysis result for SHA-256 df967b9fa0d27fee…

MALICIOUS

PDF

78.8 KB Created: 2021-03-24 22:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 894b79c6cd4a0dfd1b71eeb3dd6dc5a0 SHA-1: 649d5507ca0b3a1f154bab5d12039f9ddcb0f903 SHA-256: df967b9fa0d27fee6f864cd11e9c959a80584a5ca6a09decb5634327f2ab467f
186 Risk Score

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 link farm with numerous external URLs, including one pointing to `soxebez.ru`, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to contain keywords related to fire alarms, likely used as a lure.

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://soxebez.ru/strik?utm_term=firex+smoke+detector+chirping PDF link annotation
    • https://vanaguneselo.weebly.com/uploads/1/3/5/3/135341402/8686415.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/gh7oiRq/47903262796.pdfIn PDF document text
    • https://cdn.sqhk.co/bezedono/nSjfIbA/guzebuwam.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/bgfhgIP/business_planning_project_management.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/2bdcaea7fa26187.pdfIn PDF document text
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/pigorixupa.pdfIn PDF document text
    • https://cdn.sqhk.co/dasadogiso/egdifiR/92381619158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_1e020f9521c6422ea8425c3e835a8c34.pdf?index=trueIn PDF document text
    • http://tiluxusimutine.atwebpages.com/jogakakizemegil.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_f55f57927adb4dfa89f25805f012cd7d.pdf?index=trueIn PDF document text
    • https://0404cab7-c021-4537-be79-420bcb2f88cc.filesusr.com/ugd/52c240_d9cb68abb9d442a5abd2873608a6a466.pdf?index=trueIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_b286ec5aacc1452eb9f2e4d454e41557.pdf?index=trueIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_b6f6371d4810449d9b65e9a5ed367b61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/fedora_server_guide.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/25269993799.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/dermatix_silicone_sheet_fabric_4x13cm.pdfIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_f9c6c5000670418aae952616131b18fe.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_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5332 bytes
SHA-256: e577b138e5a42214b3593e1d29783139624943cd7872225bc94584dcf0918750
font_01_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 10916 bytes
SHA-256: 037668040f4a4b1682c8764bfec9e27116960db32be1f28153cb32901e6d0387

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