Malicious PDF — malware analysis report

Static analysis result for SHA-256 f307716810b18315…

MALICIOUS

PDF

78.5 KB Created: 2021-05-15 07:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe9828d10239fd8e3b66b73c8c56f160 SHA-1: 9a5c804073345da36f01be166d5736838118225d SHA-256: f307716810b18315b11656260ec2eac345380eacf6a6e42b535d1920f6a4fb27
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. The document contains a large number of embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=how+to+invest+in+stocks+beginners+reddit
    • http://unosital.space/lenovo_yoga_730_camera_not_working5lsrg.pdf
    • http://mukovasisoro.mygamesonline.org/baltasar_gracian_obras.pdf
    • https://vexofemefenulo.weebly.com/uploads/1/3/4/5/134594555/1396136.pdf
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/9343024.pdf
    • http://mysteps.online/converting_grams_to_kilograms_worksheetzxnpl.pdf
    • http://idealica-ufficialeitalia.website/properties_of_water_lesson_plan_high_schoolgn2a8.pdf
    • http://vurovolapoza.mygamesonline.org/ligne_10_aix_en_bus.pdf
    • https://faloxumotib.weebly.com/uploads/1/3/4/6/134646793/4530b91.pdf
    • http://ing-jobs-opportunities.com/cual_es_el_concepto_de_artes_mayoreseh6fm.pdf
    • http://jovepodixowofow.mygamesonline.org/20981710415.pdf
    • https://sekitajed.weebly.com/uploads/1/3/1/3/131383533/d4b2664.pdf
    • http://zuregazezoral.mygamesonline.org/36862571433.pdf
    • http://ig-copyrightviolation.com/kodak_zi8_manualwbz5o.pdf
    • http://dorugatutaxovi.scienceontheweb.net/riripitufosigif.pdf
    • http://nerroba.info/83797263587qndz9.pdf
    • http://betflixguvenilirmi.com/jlab_executive_earbuds_manualjwkpn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://famomijis.onlinewebshop.net/network_topology_download.pdf
    • https://uploads.strikinglycdn.com/files/722f74c0-08fe-4e13-954e-a1e54cfe6bcb/samsung_tv_remote_un28h4500af.pdf
    • http://nabenejajoko.myartsonline.com/canoscan_lide_100_manual.pdf
    • https://uploads.strikinglycdn.com/files/81c9b290-3be9-477d-bcd9-c15f52b877f6/jusopimorunusifebide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ba.bin
83e1ae38757091f7e986a826e5ff074fce1a7d97387441304407dcd01f5b2999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 5180 bytes
font_01_sfnt_off00010882.bin
74226fd85b11b9d03909c9a3129b556f9df8784555e0c1e32fca3855fd0944d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 10580 bytes

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