Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b21d16eba88cc88…

MALICIOUS

PDF

66.8 KB Created: 2021-01-19 19:47:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ac922b33356315ffeb205ce4d9688ae1 SHA-1: 6be0638d18011c382f11db6dde670c4d13e65071 SHA-256: 9b21d16eba88cc88317704ab49209d4a94439adf81f2ac9ad317110aafbf82f2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic identifying a link farm on disposable hosting support the classification as a phishing or malware lure.

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://leonvi.ru/123?utm_term=kitchenaid+slicer+shredder+attachments PDF link annotation
    • https://cdn.sqhk.co/zaperarori/Bjf6ici/dovefijexexobule.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jhchjRF/livizoj.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/12jageh/south_african_national_defence_force_vacancies.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/ggja734/how_to_use_spotify_on_wear_os_work.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/eYiihcW/change_lock_screen_pictures_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/jghggeJ/alan_walker_faded_song_piano_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/zW0hihj/tidugil.pdfIn PDF document text
    • https://cdn.sqhk.co/jepipovi/f3DPjiV/mekijadiwixolatogate.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/gffghhT/bud_farm_grass_roots_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/ianVdnT/word_connect_answers_level_1283.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/SZzgehf/fire_and_water_restoration_contractors_insurance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligunatiresid.epizy.com/joramituzisiranip.pdfIn PDF document text
    • http://mibesajaku.epizy.com/7251338899.pdfIn PDF document text
    • http://muwalolerede.epizy.com/macbeth_graphic_novel_plain_text.pdfIn PDF document text
    • http://tonezifimoraga.epizy.com/susuzafezidek.pdfIn PDF document text
    • http://bawavejukedosuv.epizy.com/personal_budget_sheet_template_uk.pdfIn PDF document text
    • http://bobujosu.epizy.com/autotune_evo_vst_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/equifax_credit_report_application.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC982 5148 bytes
SHA-256: 2af2e195b24d430a6f319fd8071f516003821e3a5f1f63c870864c36be60fcbb
font_01_sfnt_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 10448 bytes
SHA-256: 44313a3c3d0a05d4f532c3eb773ef2ed170ab014e5f182e1140c5fb15e564048

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