Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f968b3b72679ed…

MALICIOUS

PDF

75.6 KB Created: 2021-04-03 21:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 067f83e3a2c114abb0b5b106ba933687 SHA-1: 54200ad46c8e59ba660620535f915b03429daf6c SHA-256: 39f968b3b72679edcb5587c53161ab0d45948fec0806dc7d861d7b90c9cba132
134 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The presence of numerous external links, including one pointing to a potential malware hosting domain (druttle.ru), and a heuristic indicating a visual download button lure, suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards an attack pattern involving deceptive links to download malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=converter+pdf+para+autocad PDF link annotation
    • http://blancer.xyz/nerofafesewagerowr7ba.pdfIn PDF document text
    • http://ilmahli.com/25237915842lrs69.pdfIn PDF document text
    • http://genusttwsr.fun/why_does_my_electric_pressure_washer_have_no_pressure8jjfl.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/gewosusukuduwefowxdism.pdfIn PDF document text
    • http://kumokopilomeme.22web.org/15126291516.pdfIn PDF document text
    • http://outputqwvk.space/tomtom_go_60sfg4ll.pdfIn PDF document text
    • http://hayatevesigar.online/joseph_campbell_hero_s_journeyq0xq3.pdfIn PDF document text
    • http://feyakast.online/power_book_2_season_1_episode_10_recaplzdlq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_7970f69c3c874b3b98d2dd3fd6abc342.pdf?index=trueIn PDF document text
    • http://gonefuxirazu.rf.gd/28164730257.pdfIn PDF document text
    • http://zexolaxew.epizy.com/jiwuporopakelujofurowikuz.pdfIn PDF document text
    • http://gogotefabup.rf.gd/movie_maker_freeware_download_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/south_africa_miss_universe_2019_answer.pdfIn PDF document text
    • http://pibozaxasoloje.rf.gd/40122632295.pdfIn PDF document text
    • http://sejekaxupoze.epizy.com/best_games_for_android_2018_free.pdfIn PDF document text
    • http://bodudubabafixe.rf.gd/project_report_on_biodegradable_and_nonbiodegradable_waste.pdfIn PDF document text
    • https://s3.amazonaws.com/dabatisew/activinspire_studio_for_free.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_56ab9a8a85b144f0a1ab20f695d2fcb2.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_00e30617c5fa478ca10ce901c5f887cf.pdf?index=trueIn 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_off0000ea3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 4904 bytes
SHA-256: 7d78cca303510d71862d853eb8fcf8762a454d6f102429ec234c13d4a474b425
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 12088 bytes
SHA-256: 44db5d5e0fffa66761fc169b59f26fb982e7207bbaff1839467f88cacfecc41d

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