Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed5df9da2ac1656…

MALICIOUS

PDF

71.5 KB Created: 2021-02-20 13:03:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bad3d1dc94d6a046d2aafcc498811b8f SHA-1: 276cdbf6a6fcfbbaed38b730507b248aec0d6196 SHA-256: 9ed5df9da2ac1656abb82bcbee930a621dcf3cfa0323690960b396e99c255661
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 0.9998

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 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://jacksth.ru/strik?utm_term=radio+shack+pro+94+antenna PDF link annotation
    • https://cdn.sqhk.co/rixutixim/6igicb3/zipikija.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/1OkhjXm/kifivalutigakixipimikud.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/pC4jgge/powder_edit_game_clips_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/1UjhKjb/best_heart_rate_monitor_for_peloton_uk.pdfIn PDF document text
    • https://dakogepakidi.weebly.com/uploads/1/3/5/3/135391125/rupepuwiregitev.pdfIn PDF document text
    • http://womenit.space/582148434708ao91.pdfIn PDF document text
    • http://veronaital.space/1875847272274lq9.pdfIn PDF document text
    • https://cdn.sqhk.co/dutararopat/HkheGhd/juvavuremujusenewewuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/rowemarul/hgjhe5b/remibapelir.pdfIn PDF document text
    • https://toxupenowa.weebly.com/uploads/1/3/4/0/134042648/nilivatogirusew.pdfIn PDF document text
    • https://cdn.sqhk.co/lirebirab/HggibXd/haircut_los_angeles_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/743MHig/telegram_video_download_link.pdfIn PDF document text
    • http://mini-cam2.club/step_8_worksheet_aaztbez.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://titaleze.rf.gd/33711043382.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/27181114870.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/vozopunofinizijozipa.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/audio_naat_free_karam_mangta_hoon.pdfIn PDF document text
    • http://kinapemib.rf.gd/how_to_be_a_certified_quality_engineer.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_off0000d8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B6 5444 bytes
SHA-256: 1b44f1c381d2fa8cb638d54510139d799d178083dc7798af1893c2df78ed3c0f
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 11312 bytes
SHA-256: 695b7dad0597e2be930611906911f370513fc7ae05ca4ab959289c8e9c2c8a77

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