Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eaaf8995baee10…

MALICIOUS

PDF

76.9 KB Created: 2021-04-26 21:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bf358932bead8715057b3c0aa96c5f79 SHA-1: b1f6d8e64879705d7a59b61272eb3b9351d40644 SHA-256: 86eaaf8995baee107357b564a0f6f28a19779fc72a3a2ed736375a65db84206d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://midufefew.ru/strik?utm_term=ibm+typewriter+repair+near+me PDF link annotation
    • http://funokeronox.iblogger.org/toro_snow_blower_maintenance_kit.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/66556767678.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/hgtijpk/influencer_marketing_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/fthbKIW/beeswax_foundation_sheets_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/1vYn53h/voxogubujijibozekomisu.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/g0ZmEly/mi_note_5_pro_launcher_apk_download.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/jexpo_anti_ragging_form_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/chcAZhe/bopinojenonapinazopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3ecb585b-79b8-4502-8567-d9a17299c5c1.filesusr.com/ugd/4b874d_dc6a8d4f45c14383b7b92a36fd6e8c05.pdf?index=trueIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_00d58a7f05c1426d9348ac455fc4fe39.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_bcfe3910c43c4c02adfffb4641731d0e.pdf?index=trueIn PDF document text
    • http://lofadekiwi.rf.gd/44349571570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1261c8-2e4d-4652-8c80-0325901e6b01/xesedabavewaxanedolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf6a925-bf5f-4e2d-b03c-1d698700275a/which_is_better_ceramic_or_infrared_space_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba9fa64-6af1-434a-957e-f70fac131db5/banaregotokimupafulof.pdfIn PDF document text
    • http://ralefab.rf.gd/tess_of_the_road_age_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4fb75a-81a0-4bc9-8a89-b52b58e4f835/zemetibizogim.pdfIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_1faa007b91bb49c099b7103c27f2438e.pdf?index=trueIn PDF document text
    • http://lerutusuferedi.epizy.com/brush_up_your_shakespeare_sheet_music.pdfIn PDF document text
    • http://jilerixam.epizy.com/29353087745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85266725-0068-4338-8b6c-96b7e5ad635c/43377167273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0624350-5bea-4ee7-b7a1-e14789df8256/the_chaplet_of_divine_mercy_in_song_complete_mp3.pdfIn PDF document text
    • https://7f2467c6-0d80-4e38-8df7-27624e0b9669.filesusr.com/ugd/e19533_67feeb1de9494575a93c772cb29fbe6a.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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 5024 bytes
SHA-256: cf89dcbfa08d8c344f92f4e4617e6bbbb09904e79243b65761926bc4a7587aa4
font_01_sfnt_off0000ffd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD7 10692 bytes
SHA-256: 31a99519dae732436d8d7944fce4e3c45f9c62471098f4a4c33b6ce104171cea