Malicious PDF — malware analysis report

Static analysis result for SHA-256 1110563371e38fce…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 08:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 749f8a4bce74c34f30d779d4dbd05e84 SHA-1: 437487699874617e93bbff8d9af2962ce45a3961 SHA-256: 1110563371e38fcec4088a113612e2dbd9e5d32e807d9d225652caa04fa78bcf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as an external URI pointing to a suspicious domain. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/award?keyword=new+audit+report+format+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483331/normal_6051022552720.pdfIn PDF document text
    • http://usesalle.xyz/77386452108mwsfy.pdfIn PDF document text
    • http://rusakova.space/cs6003_ad_hoc_and_sensor_networks_unit_1_pptghkwh.pdfIn PDF document text
    • http://antinomi.design/pitch_anything_audiobook_mp3_downloadx0qtx.pdfIn PDF document text
    • https://cdn.sqhk.co/kigakikijebo/jdhehgg/pujeguvesiratakasuzumo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484376/normal_5fc7a2267756c.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/khdhfja/electron_configuration_of_sulfur_in_excited_state.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_60600f4fd5604.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_5fe80bcee19a9.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/gdDdmDT/pokemon_showdown_avatar_commands.pdfIn PDF document text
    • https://cdn.sqhk.co/dojerilu/02gijaT/62636760958.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/iijbTRp/286808963.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/jjjiahi/11387329249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_d0e655fce1744d04995d40cf93c94268.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_3558b41bd5264fc2bb93d075775c484d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/desedefixiwedinefoxizawe.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_0400caa1917b460ab9aac780af57af6a.pdf?index=trueIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_f41089d471a14c0ea40c95d99c3eb339.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/32613338199.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/bamitizofobawetoveka.pdfIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_64e6f67459944639b18fe4c0dbb23b9f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lefemijip/eraserheads_songs_mp4_free.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_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 5312 bytes
SHA-256: a0c27b03d5b504ac55481fe30f20f85e68719214ee65f2b036157613444cb857
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10836 bytes
SHA-256: d1f96bd90d12069816047dd05a6016c82f468d3931e5a579b6d5e5e9fbf37e2a

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