Malicious PDF — malware analysis report

Static analysis result for SHA-256 474b575c4a8c4c6d…

MALICIOUS

PDF

81.9 KB Created: 2021-04-01 23:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d6333cc8a389d18a58f72e085185014c SHA-1: d825f5cf935d48e5018cad026cca3f2444fac833 SHA-256: 474b575c4a8c4c6d70258f2f310a950bab5219dafc7af9290a908c74eab72987
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 0.9997

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://kuzutuzo.ru/strik?utm_term=environmental+impact+assessment+of+road+construction+project+pdf+india PDF link annotation
    • http://sugameloxufe.mywebcommunity.org/chakra_meditation_techniques.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/bautismo_con_el_espiritu_santo.pdfIn PDF document text
    • http://meserowogawak.iblogger.org/corian_countertop_suppliers_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5637a596-61ce-4e67-8953-8fd9cb84b940.filesusr.com/ugd/c20ea7_7cdacaefb9a44a0aa467b0a463438cfa.pdf?index=trueIn PDF document text
    • http://sasofinifujilo.epizy.com/100_best_loved_poems_dover_thrift_editions.pdfIn PDF document text
    • http://jutibigata.epizy.com/batsu_game_2017.pdfIn PDF document text
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_1e68f6d2977e47b380dbdf12cbab3963.pdf?index=trueIn PDF document text
    • http://pujumek.myartsonline.com/bible_verses_app_download.pdfIn PDF document text
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_f0bc730ae54e424781dc6f09d3ec9893.pdf?index=trueIn PDF document text
    • http://jukasuxoseki.atwebpages.com/building_bye_laws.pdfIn PDF document text
    • http://bobujosu.epizy.com/preeclampsia_severa_acog.pdfIn PDF document text
    • http://mevililuxe.epizy.com/neutron_cross_section.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/xekim.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_298e66397b8e4e1687cf4ae1808a7fa1.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_921eca52df004d75a85f60c97dac1d6f.pdf?index=trueIn PDF document text
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_a44baa504d1b40659192f091ddeb4ef1.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_b8e385296cd64494b991e088369a2b9f.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_d8ff1f57521045fea2a38d3b5919bb69.pdf?index=trueIn PDF document text
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_6d25f913dcca4c82854ebff07113851f.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_50f0d16fb0324c0c8704429ea2b6fba2.pdf?index=trueIn PDF document text
    • http://kipawewori.epizy.com/neologismo_e_estrangeirismo.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_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 5392 bytes
SHA-256: af5faf7310a92c3bcde7747a8d406637b030eae248345a92fc225c37c515bef7
font_01_sfnt_off00011479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11479 10892 bytes
SHA-256: c72dea261562fbbe45fc937ee4befe6266d0baa73cf00f118f68c9142edebac9