Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c0395caaf7ec22…

MALICIOUS

PDF

75.6 KB Created: 2021-03-18 01:45:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d959440fd9bb2921710d26ebcab0a0bb SHA-1: d34f4c153cf455079d18931b8bf65d7c76877690 SHA-256: 13c0395caaf7ec223d5a3ce31949608d7213c7ab8e57c2afffafb70c558805fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The 'wkhtmltopdf' authoring application and the presence of many external links are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=printable+fractured+fairy+tales PDF link annotation
    • http://bexowobiminefi.mywebcommunity.org/buforumigaseboxixu.pdfIn PDF document text
    • https://cdn.sqhk.co/tifirabepila/mCTSvHp/danesetibitevivuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407318/normal_6016f0c544d37.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/dwgPrib/5626574024.pdfIn PDF document text
    • https://rifuxegu.weebly.com/uploads/1/3/4/5/134525143/dakatirajiler_felafigumemod.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/8427142372.pdfIn PDF document text
    • https://doxifivot.weebly.com/uploads/1/3/4/2/134235468/feb5699a2d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_5fdc6c9e00741.pdfIn PDF document text
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/gaxapufelitebobadiwu.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/lolelid.pdfIn PDF document text
    • https://cdn.sqhk.co/vegubefeno/gUHk5ic/dungeons_and_dragons_idle_game.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/ff1d23fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_60273837deb66.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/PJhiLI7/60478891856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484632/normal_5fdd45e8537dd.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/4949790056.pdfIn PDF document text
    • http://nirenodeba.medianewsonline.com/aprendizaje_cooperativo_en_infantil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_603689f9414b9.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/bhbgcja/repairing_small_holes_in_plaster_walls.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/6d40efaa-80b9-4f3b-9d30-adbf7ed53cf0/19497854832.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_e5cca99e97a84a97adf80f99207cda77.pdf?index=trueIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_d137c75229994cbe933ada846ae35a5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e45b0c-ce73-4823-a5e3-e52ec3c735cb/ai_vs_machine_learning_vs_deep_learning_quora.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_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 5256 bytes
SHA-256: eaf05b236bbc46dc4f55d8414565967db0f74f7bbc21b6bb8814b2a8e49f5a4d
font_01_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 11376 bytes
SHA-256: 995bce45340d4626f5fb164fb845d9ff65db59f5be41076b63c7b0b3436ac166