Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b91a3d77245159…

MALICIOUS

PDF

74.4 KB Created: 2021-03-16 23:09:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdde7658b60133cbedd992151c392051 SHA-1: 9bc88a2aca181257eb3eb4d91b1bf72cd45467ad SHA-256: d3b91a3d77245159afa20f34129d29d9ea67ae0d411c4f8c38fcec409e97c890
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=mcsa+windows+10+complete+study+guide+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477155/normal_600316a44af3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370530/normal_5fcb93b9bea3b.pdfIn PDF document text
    • http://legalvictory.group/how_much_does_genetic_testing_cost_for_breast_cancerhbtyz.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/how_to_turn_on_wifi_on_hp_probook_6550b9ybum.pdfIn PDF document text
    • http://petersikdar.com/678912831564nccr.pdfIn PDF document text
    • http://lesantyqas.online/oxygen_concentrator_portable_for_saletbie1.pdfIn PDF document text
    • http://uuuuull.space/sumador_restador_de_4_bits_bcd8uxnz.pdfIn PDF document text
    • http://braco.ru/fibasiwozaeu009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495413/normal_600aee3a33435.pdfIn PDF document text
    • http://abwaab.su/9363625242126ffx.pdfIn PDF document text
    • http://muzoc.xyz/songs_justin_bieberapfei.pdfIn PDF document text
    • https://fixajunize.weebly.com/uploads/1/3/6/0/136051507/lowubo-larokuvulew-sagonawa-fosaxawileriw.pdfIn PDF document text
    • http://microdigitalmeter.xyz/7256875811id4r2.pdfIn PDF document text
    • http://opssmall.space/load_cell_sensor_datasheet3u4t8.pdfIn PDF document text
    • https://bizekexejanagiv.weebly.com/uploads/1/3/4/5/134593847/6025571.pdfIn PDF document text
    • http://qwert-ita.fun/artificial_intelligence_a_modern_approach_solutions78jud.pdfIn PDF document text
    • http://prodson.space/materiales_para_integracion_sensoriaw2q68.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_1c7cf24a4b6646008221e982e7da4e16.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_b7f24df270654dc7817aa458dcc501cf.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_4771a347c56f41489d08706af7a925bb.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_10819ad1a4fd4d40b8f447bd4d97d118.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_off0000e4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 5772 bytes
SHA-256: 6452abf3f7e5f4c22f8a5124328ea05a3d77c2a3791ff936b24382bbd48305d2
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10308 bytes
SHA-256: 85e3531ef3595411d332382119030120da05a1facb86cc8b7b9e699b8e53f628

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