Malicious PDF — malware analysis report

Static analysis result for SHA-256 871c482b37032f7b…

MALICIOUS

PDF

77.6 KB Created: 2021-03-31 09:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8d7d2141b553a0b60c93b2fa74b33f18 SHA-1: e766c6a7180fa97bd4ff1154ed3bdf193a8447f5 SHA-256: 871c482b37032f7bdc805212d154e33445de0c703c0efb65d0cdf81ac8e19447
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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/strik?utm_term=hoover+steamvac+solution+alternative PDF link annotation
    • http://mobufuwiwid.medianewsonline.com/18652414863.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/SYhh4P0/bonolobasibudik.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/stem_cell_research_pros_and_cons_list.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ZyifQji/wordpress_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/ddLpcHB/pixel_car_racer_mod_supercars_ios.pdfIn PDF document text
    • http://teachost.com/hallelujah_chorus_sheet_music_downloadd4xw9.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/Zjgliel/aik_malmo_ff_live_stream.pdfIn PDF document text
    • http://noksipals.online/can_you_play_world_war_z_cross_platforml3o5b.pdfIn PDF document text
    • https://cdn.sqhk.co/derilalovate/je0PCLs/vunutifozeligividavume.pdfIn PDF document text
    • http://trend-sales.fun/gokoredaxibejaxufezafl62w.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/SticpyH/buninyong_bike_race_2019_road_closures.pdfIn PDF document text
    • http://priz24.site/nintendo_ds_lite_price2mfes.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/abstract_algebra_with_applications_spindler.pdfIn PDF document text
    • http://wozilimesiz.mypressonline.com/2072250280.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogivotosu/jcZyJ07/aesthetic_wallpapers_iphone_8_plus.pdfIn PDF document text
    • http://gipovasota.sportsontheweb.net/84552634545.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/5idgc7Q/27795848233.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/jchdNij/quran_in_english_translation_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/crimson_court_curios_guide.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/92947027769.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/56131418630.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_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 4964 bytes
SHA-256: c3b446fbdc112fff534a20969359e2bdb82c1dfb837b5883d62ea76be36619e4
font_01_sfnt_off00010000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10000 11716 bytes
SHA-256: 42c6cbeb785bdd6c0b3c83fa02c98fe6b16954127582c2644ed5ee4d7ec655a2

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