Malicious PDF — malware analysis report

Static analysis result for SHA-256 d557efcc19adac89…

MALICIOUS

PDF

73.6 KB Created: 2021-06-01 02:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1ffed4bee6003f42f9858880871a61b0 SHA-1: 48773ce91d8e1dcce6d39bf69c040329e264e9e0 SHA-256: d557efcc19adac89d5ff0d1860792df4e2116907cf9704a0e47edb9c7e8e9ba4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/123?utm_term=visual+text+comprehension+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490934/normal_6036bb971fd2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377902/normal_5ffda23ba6c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486346/normal_606c9966734db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365541/normal_601d06c8c4909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459935/normal_5fd937613b2a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_604ceec9b6ccb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_6058cccb19586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gediripu.pbworks.com/w/file/fetch/144422595/vekozinijawazowudomikim.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144418101/what_is_inner_transition_metals.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144414648/biruponozemagikoz.pdfIn PDF document text
    • http://pupowivala.pbworks.com/w/file/fetch/144426171/32749882618.pdfIn PDF document text
    • http://tebejeloxid.pbworks.com/w/file/fetch/144424002/55442662685.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413310/vepebekudejepebatotesi.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428652/seriwafoxagoxi.pdfIn PDF document text
    • http://bovojigu.pbworks.com/w/file/fetch/144420123/piramuxudilawijomemom.pdfIn PDF document text
    • http://mudowomuxexo.pbworks.com/f/where_do_i_find_my_w2_in_adp.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/daily_employee_attendance_sheet_in_excel.pdfIn PDF document text
    • http://magogopowo.pbworks.com/w/file/fetch/144431754/what_is_the_difference_among_formal_functional_and_perceptual_region.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/68442470957.pdfIn PDF document text
    • http://garigor.pbworks.com/f/vida_y_muerte_en_la_mara_salvatrucha_chapter_1_summary.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423594/65741816773.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/wings_of_fire_free_download.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/applied_research_sample.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/lobenan.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144422451/juvixiv.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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 5360 bytes
SHA-256: 3f6574292886cb98cf032ad7046de5fe66e03b554ec873a2cc5e3c410f3a49d8
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 11284 bytes
SHA-256: 9c1e0ea8735c2866e5ceed3f311efd08f0997febd9a3a5ceba13c1a6309bb13d

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