Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef3fcf700c554d8…

MALICIOUS

PDF

77.4 KB Created: 2021-03-18 01:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cfe03e5085e38a00ce461a09ed1d3490 SHA-1: 7ddfcb98f256624c0b230e3476c3bf171a1c0f11 SHA-256: 3ef3fcf700c554d8592342bceb5d512aa7976bd4aedb3679ad0c1d51d3c67bb1
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/wix?keyword=zenonia+5+mod+apk+%2528zen+money+exp+infinity%2529 PDF link annotation
    • http://perevozka.ru/advanced_engineering_mathematics_kreyszig_solutions0xsiw.pdfIn PDF document text
    • http://biweekamnf.com/pays_et_capitales_d_afriquebpqn9.pdfIn PDF document text
    • https://cdn.sqhk.co/jebuxanit/zhjghje/idle_arms_dealer_tycoon_mod_apk_android_1.pdfIn PDF document text
    • http://am-sound.ru/tofoposejitetomilesujanop0cbh0.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/6WjdijD/the_guilt_trip_movie_review.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/7455620902.pdfIn PDF document text
    • https://pezomivagijo.weebly.com/uploads/1/3/5/3/135392772/8457357.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/pifazitigigofevaje.pdfIn PDF document text
    • https://vikurevago.weebly.com/uploads/1/3/1/6/131606257/39e159972.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/gozurimawoxuvomi.pdfIn PDF document text
    • https://pepigapipewoma.weebly.com/uploads/1/3/4/0/134000130/e617bcab.pdfIn PDF document text
    • http://suxelutete.22web.org/wisukekapekuwixuworolawit.pdfIn PDF document text
    • http://proba7.xyz/dafolumitomti9cq.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/7545370.pdfIn PDF document text
    • http://faxusigeroles.sportsontheweb.net/percy_jackson_series_movie_download.pdfIn PDF document text
    • http://tejidetegowewi.iblogger.org/veni_sancte_spiritus_taize_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tudawufed/49415209025.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/png_stickers_for_picsart.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/esc_guideline_heart_failure_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/ways_to_prepare_for_interview_questions.pdfIn PDF document text
    • http://vomifavub.epizy.com/nice_guidelines_fetal_monitoring_during_labour.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/millennium_bcp_annual_report_2018.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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 5400 bytes
SHA-256: da365d02deb05897aa04334f3dda2ac24b5667fcc8ee899708424cd70ddce279
font_01_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 11292 bytes
SHA-256: 34af479d55f35ccad24ab1625d5f25a03cd2215b6afd9318b16f6f5e283d0eb1

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