Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99ad47399c4b156…

MALICIOUS

PDF

75.8 KB Created: 2021-03-17 22:34:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ba89d6c466c545878b34f4a0c903a630 SHA-1: 51e3c9d90856a8182ac6dc2368cba6dcc2f2c53a SHA-256: e99ad47399c4b1569201378384746362ee263d3973fb26ac20ee5924d0f074e6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jumiwimov.ru/123?utm_term=java++offline+windows PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383322/normal_5ffb8ca6ea3a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fufejapopunu/WijEwic/fixejigedatexubozokulu.pdfIn PDF document text
    • https://cdn.sqhk.co/xexegapimuwi/kgfjcrB/slither._io_videos_youtube.pdfIn PDF document text
    • https://visufevulun.weebly.com/uploads/1/3/4/3/134310134/vexogugodat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417023/normal_5fce18475c3b0.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/gadamer_truth_and_method_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/iaYhbhf/children_s_flying_monkey_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/roratumopiv/esykjX9/37216792373.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/bikaxifuragiga.pdfIn PDF document text
    • http://matteset-spon.space/cars_2020_suvrw6gb.pdfIn PDF document text
    • http://bigtittybella.com/57657752192brk11.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/free_english_spoken_classes_near_meh8d9m.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/ifhjPgj/caracteristicas_del_materialismo.pdfIn PDF document text
    • http://thedefenseforge.com/539390674002ev5k.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454161/normal_603f14941acdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_dd75c0615c664ed29037ebddc30d2a72.pdf?index=trueIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/69325881910.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/first_90_days_app.pdfIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_fafd7683d1eb49f0be11bef8ed5f73c5.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_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 4944 bytes
SHA-256: 1a2bae7c8f9c4f0950f584fe811309e5879f418589e9305db8b5c5f47e3a3792
font_01_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 13928 bytes
SHA-256: 68a686c3279330bf9dd52522799b3ab77ba54814b5274a495e05c58a138d45cb

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