Malicious PDF — malware analysis report

Static analysis result for SHA-256 853a81e3bc012530…

MALICIOUS

PDF

74.3 KB Created: 2021-05-03 11:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d87975108cafdbb4e5beda1fb4a9a344 SHA-1: 36ee3d23103616fc65d3bd7324812518970f94cf SHA-256: 853a81e3bc0125303edb397fc613d7ee0cfc45c9376cbf61291596f386c96227
186 Risk Score

Malware Insights

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

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 0.9998

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://lozipotod.ru/strik?utm_term=how+do+i+adjust+the+draw+weight+on+a+compound+bow PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458388/normal_605219adb974e.pdfIn PDF document text
    • https://tejojixamabaje.weebly.com/uploads/1/3/2/7/132740549/tejabarapone-xakekowa-garofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_603ff2f15be84.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/sizevexupo.pdfIn PDF document text
    • https://zoxanomo.weebly.com/uploads/1/3/1/1/131163640/feresusivegoxof.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/where_would_you_go_bernadette_cast.pdfIn PDF document text
    • http://gopagafab.medianewsonline.com/marathi_marriage_biodata_download.pdfIn PDF document text
    • https://pikelevadesos.weebly.com/uploads/1/3/1/3/131384679/vosesevusigafa_fexakazameza_libipotepomekup.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/3017795.pdfIn PDF document text
    • https://wovufimi.weebly.com/uploads/1/3/5/3/135327312/nanumifapup-fojumo-javaponuwale.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/87193129043.pdfIn PDF document text
    • https://rizebilawi.weebly.com/uploads/1/3/0/8/130814716/gubaworoka.pdfIn PDF document text
    • http://riwozizedilar.mygamesonline.org/tojawoxolibumeximitanede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_5fe6423652bb1.pdfIn PDF document text
    • https://vibofizetukoz.weebly.com/uploads/1/3/0/9/130969748/lefag-zugudekijijiji-fawaxaziv-wulowide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_4be0336110b2481f9bf1de9b6350d3a2.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_995e1847881f4a5db05af1d9a8c530a8.pdf?index=trueIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/dewalt_18v_battery_in_14.4_v_tool.pdfIn PDF document text
    • http://rufapapufogap.onlinewebshop.net/explain_the_difference_between_intranet_and_extranet.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_off0000e4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EA 5724 bytes
SHA-256: 7b3f4032bfbff3e7114e1b1149625f58b567c948b600f847530fccc60a0e51c0
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10468 bytes
SHA-256: ccacec5c81d7148c3aa0b1c717a76bbdf3779cfd994b182b8337780e024e16ca