Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a81ac61ac3b24e…

MALICIOUS

PDF

77.8 KB Created: 2021-04-30 00:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 783c76d6f7011e0275229fc756e84568 SHA-1: 95a50d42f98531ac01f8e31e007e626deaf41797 SHA-256: e5a81ac61ac3b24eb932ddcc974d3c3bf341914acaa8e483fa19abdcf88d40f9
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 0.9991

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://gimoguvi.ru/strik?utm_term=curso+de+primeros+auxilios+bogota+gratis PDF link annotation
    • http://cashbackk.site/wonowulosoxufezisadufesbyw42.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/6339048.pdfIn PDF document text
    • http://supobesopo.mygamesonline.org/seranudamepuzagefetuf.pdfIn PDF document text
    • http://badgesverified.com/funeffiouj.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/pixidufagulubowux.pdfIn PDF document text
    • http://vonurejawata.iblogger.org/free_music_app_for_offline_use.pdfIn PDF document text
    • https://vipelunova.weebly.com/uploads/1/3/2/7/132712034/280162.pdfIn PDF document text
    • http://bioforcecolumbia.site/732267854657paxp.pdfIn PDF document text
    • http://vinograd.io/behind_closed_doors_book_wikifn9eo.pdfIn PDF document text
    • http://alsamcctv.com/3955770852375243.pdfIn PDF document text
    • http://streamsweets.com/counting_games_for_preschoolers_onlinegk6lj.pdfIn PDF document text
    • http://flowerport.store/gateway_dx4860-ub32p_upgradesq4fu3.pdfIn PDF document text
    • http://eferevole.com/free_online_medical_surgical_nursing_bookuwh3i.pdfIn PDF document text
    • https://werakemil.weebly.com/uploads/1/3/5/9/135973214/655d8b77e9.pdfIn PDF document text
    • http://mebelintera.ru/cambridge_checkpoint_past_papers_2015r7krc.pdfIn PDF document text
    • http://reduslimitalia-official.site/65215489207at384.pdfIn PDF document text
    • https://cdn.sqhk.co/susojareb/ajcicid/lapivoxufibefon.pdfIn PDF document text
    • https://xetuvamabur.weebly.com/uploads/1/3/1/4/131409037/429901.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/57bbc.pdfIn PDF document text
    • http://gawolesimavuvad.22web.org/dragon_age_origins_multiclass_mod.pdfIn PDF document text
    • http://gipodobisuweg.iblogger.org/algorithms_sedgewick_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/ii9Zv5A/island_blast_fireworks_display.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimixof.onlinewebshop.net/how_to_install_xfinity_cable_box_to_tv.pdfIn PDF document text
    • http://biburusig.myartsonline.com/embankment_construction.pdfIn PDF document text
    • http://lakekawe.rf.gd/calefaccion_por_pellets_informacion.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_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 5392 bytes
SHA-256: 575a019e1b70b4ad72ec69ed905eaf1a341b4e8c0f3b2778842153715b093b0f
font_01_sfnt_off0000ff39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF39 12420 bytes
SHA-256: b9b7f3a77788950665bf3fa63e2a620ae6097e459c726c32196647d721659f07

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