Malicious PDF — malware analysis report

Static analysis result for SHA-256 318ff4a80f0f5d3e…

MALICIOUS

PDF

82.9 KB Created: 2021-04-06 23:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 163fe148eb21bf699b00d7b8bd184b5a SHA-1: cf0e67c3bf0631617995555f11fbf9f405bce3c7 SHA-256: 318ff4a80f0f5d3e1aab89fbf20e09d7862f42c4d6ca78eaba4e5b26e71156bd
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of multiple links and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic suggest an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=interior+design+class+nyc In PDF document text
    • http://rentline.pro/1000_english_grammar_test_practice_questionsxgw3q.pdfIn PDF document text
    • https://cdn.sqhk.co/busanurutar/eJSgiyS/weather_houston_forecast_radar_severe_alerts.pdfIn PDF document text
    • http://lestyprin.online/83265127603erbic.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/2ijjiU5/maze_runner_book_series_amazon.pdfIn PDF document text
    • http://soldatskaya6.ru/545877316314dv3.pdfIn PDF document text
    • https://cdn.sqhk.co/zaliroded/ieXMgiE/srijanshil_smart_apple.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/ehc1gjx/digowumafike.pdfIn PDF document text
    • http://espaceabone.com/adobe_reader_create_onlinejdd4t.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/mggGhjE/counter_strike_online_2_free_download_for_pc.pdfIn PDF document text
    • http://static-start.top/lorimar_publishing_let_reviewer3u9nr.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/f8a2e34c-959b-4451-9a57-9fbd4d962e15/nordic_track_skier_for_sale.pdfIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_0566b6747e1b4106b709453ac0302228.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/goviwigax/coshh_data_sheets_petrol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc920c9-cca7-41ec-bc1c-dbecd90f3308/toyota_sienna_2006_new_price.pdfIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_085e2c76f28a4667a4c113eaa16d5a1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/55718931318.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/36801885536.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/pijutewefuwomipowirize.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/54805500226.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/cuanto_es_un_salario_minimo_mensual_en_mexico_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b4d4228-7ce2-4b66-b459-8bb48bc89aed/fejadalugoxugagapinifoma.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_off000105f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F4 5148 bytes
SHA-256: cf0c4652ec39530e590b238b889d781a3b78b872769339f6f083c3ede923965a
font_01_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 11228 bytes
SHA-256: dcd6b157f0463d177d5cf7360301dbe9f2205711df5dcc47e9e8d746b8ea2532

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