Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf18f8f2435023f9…

MALICIOUS

PDF

72.6 KB Created: 2021-03-03 18:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a74eaac844d69de73b2bcd739c6a4e8c SHA-1: 513f56d149c77595e7fd6ed45d123c783d2ba328 SHA-256: bf18f8f2435023f9f2e3ded4c329acdf66d7dc378c5571fcfe06eae891312d3c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and a specific heuristic flags it as a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to 'aswb practice exam free', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/123?utm_term=aswb+practice+exam+free PDF link annotation
    • https://ledegukumimajem.weebly.com/uploads/1/3/5/3/135393042/vimexem.pdfIn PDF document text
    • http://lipexifinidoda.scienceontheweb.net/xelebelerabarikatoleda.pdfIn PDF document text
    • http://small-italy.space/zudabesijonenolexurzlmqe.pdfIn PDF document text
    • https://kegalanomer.weebly.com/uploads/1/3/1/8/131856310/gonuxivo.pdfIn PDF document text
    • https://danawojigu.weebly.com/uploads/1/3/1/4/131407111/2149843.pdfIn PDF document text
    • http://narezekopalezi.iblogger.org/ninatelow.pdfIn PDF document text
    • http://zofapojofiwifi.iblogger.org/92630177998.pdfIn PDF document text
    • http://the-english-temple.com/rageguxuvabapidapaxoded7cfl2.pdfIn PDF document text
    • https://bemisawu.weebly.com/uploads/1/3/4/7/134716701/nuzed_xivudakilasola_nuduwexunal_wujijobiweru.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/pedorunumu.pdfIn PDF document text
    • http://yandex-delivery.cc/back_to_the_future_game_free7wygs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dosidojabar.epizy.com/settlers_online_valiant_little_tailor_guide.pdfIn PDF document text
    • http://buxuzob.epizy.com/comeback_jonas_brothers_sheet_music.pdfIn PDF document text
    • http://deweget.rf.gd/beyblade_burst_app_mod_apk_android_1.pdfIn PDF document text
    • http://litafiwu.epizy.com/14885309969.pdfIn PDF document text
    • http://dojidusajotat.epizy.com/98782736018.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_off0000df58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF58 5420 bytes
SHA-256: 3288d554bc889d7c57540baf1e482c71946104d987b4435d068bac7e957bdc22
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 10536 bytes
SHA-256: 4c1d92728e083de456f5a36af04413152b8c6c63711df953ec8cd9f58d323df7

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