Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e96f8c13d5c3cca…

MALICIOUS

PDF

73.2 KB Created: 2021-05-12 20:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f7d8b7a461503306721cfba10cd5bd3f SHA-1: 2580844c37f4fc0c8dcf5a5ea9f77694da49723f SHA-256: 8e96f8c13d5c3ccad346fa30f68a829932c4b4ea027656a3eb55d826b6a6ae00
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable domains or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://baarspo.ru/strik?utm_term=build+my+life+housefires+lyrics+pdf PDF link annotation
    • https://cdn.sqhk.co/mitugejaxel/ibhhRih/spider_solitaire_app_android_kostenlos.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/bIk9uJf/download_cooking_adventure_mod_apk_terbaru.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/hcjcifq/35021463826.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/jjryzJ3/learn_spanish_podcast_download.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/kindergarten_grade_math_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • https://cdn.sqhk.co/vujaderaz/cdibNgc/dumotajabotofumesug.pdfIn PDF document text
    • http://dubiniba.iblogger.org/99405880712.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/haugeje/rodunaxejunabenorojer.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/ifbjiG0/desusazobikikutuxa.pdfIn PDF document text
    • http://ledaxobakisufi.22web.org/istqb_glossary_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/hepojy6/my_talking_tom_gold_run_game_mod_apk.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/b76ecbf9-64de-4b8e-80bd-33847da3ada1/pocket_life_book_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f9e1e8f-b4c3-44c8-a2d8-cb8e39d9292c/32967948824.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_48cc8bbcc9144aeba64f9a4164419873.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb6ebf1-ceab-4258-8a84-ca9ff1835d77/algebra_1_quadratic_functions_test.pdfIn PDF document text
    • http://gejizejaniwijef.atwebpages.com/calendario_laboral_2020_barcelona.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_b784278d75f240fb87f8977715fc51ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20ba2318-9f32-480c-81a1-96559e5bf90f/77429405617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74cfcca-cdfa-4ee3-a728-49b73ba61f5d/que_hace_un_lider_espiritual.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/kuvusovufifatafejovol.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_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 5336 bytes
SHA-256: 8e9e026a4c7cdde42363434fa30abf4a49f2ff04cee3a410b52c7b48ab8bf850
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 11192 bytes
SHA-256: a7cd1b6758c5f9139f9cf1608d5c699a4994319a1db88d25787aae89fcbdea15