Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a3a9b29eb97cfb…

MALICIOUS

PDF

73.7 KB Created: 2021-06-02 19:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 94c40f01243bbedce190eaa4026a190c SHA-1: 9d9dc5319d588fe08e51c2138d2d5c9a0c6e58e0 SHA-256: 18a3a9b29eb97cfb45e61383acfa3d753196005e146ecd737309ce37cb27021d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://xajibur.ru/123?utm_term=zihale+masti+song+ringtone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411480/normal_60483da86b765.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389387/normal_6002c2ababa64.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4375517/normal_60b5fa5228907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_603ba650070ee.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421207/normal_60b353fc97bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420013/normal_5fd6efba39afb.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379498/normal_60b3d34236490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487206/normal_5fdf4af745ccf.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/b578fe10-514b-42da-8a4a-05030dae8445/84746180034.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415644/31528921437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff2612c-b794-4152-ba9e-af01f2d1737e/solving_quadratic_equations_by_completing_the_square_worksheet_answers_glencoe_algebra_1.pdfIn PDF document text
    • http://tejudafo.pbworks.com/f/zijuwoxanixolosibuwaruma.pdfIn PDF document text
    • http://barumena.pbworks.com/f/descargar_libro_biologia_helena_curtis_6ta_edicion.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144431871/19681890206.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/w/file/fetch/144458556/wisorumakazul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/209f3764-62fc-49d4-97ea-bed94a3135cc/ge_xl44_oven_manual.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144491988/fahrenheit_to_celsius_equation_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc1950c-36d4-498d-aa46-b5290855b21c/10425504753.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_off0000e24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24A 5056 bytes
SHA-256: dc5155687b8e5947a0ce524d22d1ed4784834971ef31fbf5e708b6da78d6e654
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 10720 bytes
SHA-256: 399e413f9b4a56d1bc36e9463e51b1e004c5d54eedf4b80706eb10c0aafcdb7c

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