Malicious PDF — malware analysis report

Static analysis result for SHA-256 459a6aef79f00b9c…

MALICIOUS

PDF

72.1 KB Created: 2021-04-07 19:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f96a215f998252effd61c78806c99c10 SHA-1: 27e344c0e4900b249b8b5e3c0874f9dd0ef81cdd SHA-256: 459a6aef79f00b9c07666043fd45e3ada15b4d0e55b3c77a5e2a07d07dabb87c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The file contains numerous embedded URLs, many pointing to disposable hosting, suggesting a phishing or redirection scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the attack pattern of using the document to drive traffic to a network of potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://golowaki.ru/strik?utm_term=pulgadas+y+milimetros+de+llaves PDF link annotation
    • http://midunetojonawiw.mywebcommunity.org/lp_abortus.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/narokipotojogilupuno.pdfIn PDF document text
    • http://kipegujodup.getenjoyment.net/pathoma_2017_google_drive.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/advanced_excel_functions_with_examples.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/sovugax_mujop.pdfIn PDF document text
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/2977301.pdfIn PDF document text
    • http://magnitoli-2ekran.site/besame_mucho_alto_sax_sheet_music8kl31.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/veruwizo.pdfIn PDF document text
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/8140365.pdfIn PDF document text
    • http://finansi-7.online/sazokoq6adx.pdfIn PDF document text
    • https://narukomoforu.weebly.com/uploads/1/3/4/3/134320250/ed54df5dfd75dbe.pdfIn PDF document text
    • https://vuduxedife.weebly.com/uploads/1/3/5/3/135337585/c397262.pdfIn PDF document text
    • http://sikevemekoma.mypressonline.com/beginner_guitar_chord_chart.pdfIn PDF document text
    • http://arm-watch3.club/875252497117m6jb.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/ceh_v9_certified_ethical_hacker_version_9_practice_tests.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/what_does_mixed_blood_mean.pdfIn PDF document text
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/c6b012e4930ec89.pdfIn PDF document text
    • http://swiss-family.space/puxiduvomofazelexztja.pdfIn PDF document text
    • http://bella24.xyz/talejubozater5fsi.pdfIn PDF document text
    • https://mubujibazakob.weebly.com/uploads/1/3/3/9/133986275/c4e61d80377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46755851-014e-44e6-bb81-ca87f6e326bf/79320654567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1fba233-a3f6-42cb-b3d9-f2c8509d9af6/sole_f85_treadmill_disassembly_for_moving.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/bakuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c6f6ea-5063-46ab-9dcd-c7a56fbc45c6/logobetabar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056b678a-d410-41de-bcda-ea9020b78fb5/how_to_clean_tower_fan_lasko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edb6352-619f-4a72-988f-e09bde35e65e/vopiz.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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 5308 bytes
SHA-256: 80d1dea1eabe61de73c311893970b99b9f236daddfc594d0924abbbdbd8f7fd6
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 11252 bytes
SHA-256: 143d8acc8b08667ca9d66d78f558e9a875ef660d36b83e7edd94a0a75564ee1f