Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d769ddc93b5701…

MALICIOUS

PDF

80.4 KB Created: 2021-04-01 16:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d241570779a518866ced3693aef5bc61 SHA-1: 6b82b54739bb5c7c0b220948d96f60e89a004e3b SHA-256: 18d769ddc93b570158407f110d2c66cec38ab5ce60c1e84b1a51770ada18b6a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=papa+pear+saga+apkpure
    • http://pewekelexu.mygamesonline.org/behind_the_presidential_curtains_book_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4410459/normal_600c089b5f258.pdf
    • http://giwitap.getenjoyment.net/nevuwefibabekazodosafiwos.pdf
    • http://rowexusaje.mypressonline.com/weekly_business_planner.pdf
    • https://cdn-cms.f-static.net/uploads/4458614/normal_602d2b5b07acb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fomudebipefasu/glenmark_life_sciences_annual_report.pdf
    • https://uploads.strikinglycdn.com/files/9210826c-9f1e-484f-8fe8-a8f8fee25e6e/hoover_windtunnel_rewind_filter.pdf
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_2d16abf38afd47f2936f53792a021493.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b4048fd0-1ed2-43a0-a78c-0230116a85db/h81m-e33_cpu_support.pdf
    • https://s3.amazonaws.com/nazekisigiduz/13313987215.pdf
    • https://s3.amazonaws.com/nabifovu/breadtalk_group_limited_annual_report.pdf
    • https://s3.amazonaws.com/fizup/anet_a8_software_guide.pdf
    • https://uploads.strikinglycdn.com/files/1314f091-b933-460c-98ba-5ea0fe68f759/wizigufejeze.pdf
    • https://uploads.strikinglycdn.com/files/a9961b1e-3274-4b0d-817b-a3318db3334c/11629488418.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_dd16725ff39a40748fca81672f01dbdb.pdf?index=true
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_bf8dd895df6f4b0cbbeda896a1e48726.pdf?index=true
    • https://s3.amazonaws.com/tuletivotarupu/amazfit_gtr_watch_faces.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe1f.bin
0ba16274509f102e9e050019d7e53fd8aa9864f865bb13e2e52e6b3f0388152f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 5020 bytes
font_01_sfnt_off00010f49.bin
53021e6f606ef3cb6d1225bcf8331a4a0b32888680dc6e12d94b0eabc060b77b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 11040 bytes

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