Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6a5f8562f1fc84…

MALICIOUS

PDF

79.0 KB Created: 2021-04-11 21:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4185148e2935dd066e0a6374572a0d96 SHA-1: 7baf1889724318e9319b32a6a7d949d334c932b8 SHA-256: 8b6a5f8562f1fc841d0ac6f7554a9c47cb5df2cbbaabdd1742d612f4a2c2e17b
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many of which point to disposable hosting or known redirector infrastructure, suggesting a phishing or spam campaign. The ClamAV detection name 'Pdf.Phishing.Trojan' further supports this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=should+you+keep+clothes+that+don%2527t+fit In PDF document text
    • https://lelibajoterudu.weebly.com/uploads/1/3/4/0/134042739/vomij.pdfIn PDF document text
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/2ece00ef.pdfIn PDF document text
    • http://timelessdecorum.com/kewesoguxomoferududafer4wzss.pdfIn PDF document text
    • http://front-glass.website/jurassicraft_wiki_fossild6o4d.pdfIn PDF document text
    • http://tatanip.medianewsonline.com/how_to_program_remote_for_liftmaster_myq.pdfIn PDF document text
    • http://tipografiyav.moscow/fiseruduwopisunaggp8bu.pdfIn PDF document text
    • http://dusikazo.mypressonline.com/cello_sheet_music_free.pdfIn PDF document text
    • https://xomipuladijig.weebly.com/uploads/1/3/4/4/134401164/ruparov.pdfIn PDF document text
    • https://kugarinunixi.weebly.com/uploads/1/3/0/8/130813781/vevewoxapokagup_nazivas_bumemumigiku_suxavubovos.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/fapigikekomun.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/begokaxawip/hc5V6U9/85781270153.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/lederumevetalonale8nkeg.pdfIn PDF document text
    • https://cdn.sqhk.co/zovifesojeme/jeqiagi/dialer_apk_for_android_4._2._2.pdfIn PDF document text
    • http://confirmationhelpcenter.com/sharepoint_designer_2010_approval_workflow_examplesctlc5.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/mcgraw_hill_ap_us_history_textbook.pdfIn PDF document text
    • http://wacc-cat.org/nebewr0daa.pdfIn PDF document text
    • https://dogaralezuj.weebly.com/uploads/1/3/1/6/131637140/sizup_muwipi_mapuximijunalob_makufuxe.pdfIn PDF document text
    • http://telemprom.xyz/avec_mes_remerciements_anticipsjux1l.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/jch6whi/90822791723.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pabizex.atwebpages.com/the_hidden_sense_synesthesia_in_art_and_science.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_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 5448 bytes
SHA-256: 59a885da16a0bad22fe29a3aaa58bdfca2368e78ffa355891af5c482db099ad4
font_01_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 11444 bytes
SHA-256: 6b5bb0bdd84576fad739e166030cabf0fd5ec6a0f46c479ebdc727c098cd3293

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