Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4fe8c5c29c2adf…

MALICIOUS

PDF

72.7 KB Created: 2021-03-24 15:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 762c99e8587b7b51d4a925b40b5d257f SHA-1: 8323472621c5d4ad184ed9605c1815df5d5caa35 SHA-256: fe4fe8c5c29c2adfa659d03652100aa85a53c55ee1585cf9b6f0c4f9924aeb0b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a link farm designed to redirect users. The PDF's structure and the presence of external URIs suggest an attempt to direct users to potentially malicious websites, aligning with phishing or malware distribution tactics.

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=spinner+in+recyclerview+adapter+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443801/normal_60397c44e5024.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/6eigWij/minecraft_magic_wands_mod_1._12._2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500429/normal_60341c8fbda80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5fd1edff63125.pdfIn PDF document text
    • http://ledimpress.biz/nissan_370z_facelift_2018_interior5wskn.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/3idzhjG/h_band_2._0_website.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/dFJjbhf/video_bts_seoul_music_awards_2018.pdfIn PDF document text
    • http://sqrab.top/1503633645wlo9.pdfIn PDF document text
    • http://comp-arenda.site/toyota_camry_hybrid_2018_price_in_bangladeshwoasi.pdfIn PDF document text
    • http://pasendapp.online/how_to_fix_air_compressor_hoselxv3r.pdfIn PDF document text
    • http://beststudent.fun/mcat_scores_needed_for_do_schoolsamcwz.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/aiag_machinery_fmea.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/eURhc2C/social_media_viral_video_bihar.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/gEhbzia/raid_shadow_legends_champions_that_remove_buffs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/gipijitezuzudepesodidoduw.pdfIn PDF document text
    • http://vepijukakogad.rf.gd/what_is_criticism_in_literature.pdfIn PDF document text
    • http://rofuvawitarul.atwebpages.com/runisanaxikozumagal.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/bootstrap_card_carousel_template.pdfIn PDF document text
    • http://galavazisosi.rf.gd/93558814931.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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 5244 bytes
SHA-256: 99f265b3dc0f8b8fd9f3b63b524fbceec712052a5968ce0a6efcb29e3d106610
font_01_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 11172 bytes
SHA-256: c5a671604d71b0d7a26a2e5d11f482e99df49d79e48db28caaf302464c2729cc

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