Malicious PDF — malware analysis report

Static analysis result for SHA-256 07809a3879c143f4…

MALICIOUS

PDF

129.5 KB Created: 2021-02-15 06:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c61c75af41a7337e799b8f785b5a7204 SHA-1: e4439163bed0b32cc36e4423f99d53ac5142e5c5 SHA-256: 07809a3879c143f4520496f63301b2efc5c782036f5c6dadf02e899a1fdd3ad1
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many hosted on disposable domains or subdomains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://seumenha.ru/aws?utm_term=entropy+in+information+theory+explanation PDF link annotation
    • https://cdn.sqhk.co/bebetirifam/sFjdrWE/3d_horror_sound_effects_mp3_free_download.pdfIn PDF document text
    • https://luzenesezenobo.weebly.com/uploads/1/3/5/3/135307250/6c96136.pdfIn PDF document text
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/01abbc.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/powumozizera_buxat_xapemi.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/hbSjhge/battery_charger_subnautica.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/UGfjbhh/manakaguvuv.pdfIn PDF document text
    • http://odemebayisitrafik.com/xapowddq53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_6029d659892e8.pdfIn PDF document text
    • https://pidedofafotego.weebly.com/uploads/1/3/1/4/131438241/9cb72288d.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/evolutionary_changes_in_primates_30_answer_key1o476.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/d7Ngeje/tumblr_quotes_backgrounds_for_iphone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5ff556f00bd56.pdfIn PDF document text
    • http://megahit.space/online_registration_form_of_uosdlv5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482619/normal_6014ec1e67a6f.pdfIn PDF document text
    • http://yeswins.space/11611006029a8nb.pdfIn PDF document text
    • http://nuzovofevaduw.22web.org/83919612550.pdfIn PDF document text
    • http://gonzo-3d.com/kenmore_he2_plus_king_size_capacityfw691.pdfIn PDF document text
    • https://mavoxigomag.weebly.com/uploads/1/3/4/0/134096713/xuwipenolu_nopesiper_rusijelutig.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/bghrdHG/beast_mode_run_through_face.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_600c633c903a7.pdfIn PDF document text
    • http://bestita.space/ecological_solid_waste_management_actw85ty.pdfIn PDF document text
    • http://rrrrkkkkk.space/detozc0mia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wikilupari.epizy.com/minecraft_herobrine_mod_1._8_9.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18498 4876 bytes
SHA-256: a077ab1f465d1119d626d54be0a3d382cd0c87c37241cc60647e78215937c9d9
font_01_sfnt_off000194c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C2 6300 bytes
SHA-256: f4621731e9c2c2c083dcfb72a0c7097a47f8c7d7878b5f2123de2531c532860d
font_02_sfnt_off0001a41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A41A 14144 bytes
SHA-256: 62fb4d0ab4fc90e8a08a653d68fbd75b66fdcb65ce502279b681ca9f645cbb56
font_03_sfnt_off0001d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2CC 16340 bytes
SHA-256: d723d6f1ae7dc869109318c876cd01625442c37f07a13e408331b71d920edbbf
font_04_sfnt_off0001e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8C2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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