Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca30135949dbb80…

MALICIOUS

PDF

80.8 KB Created: 2021-03-15 20:54:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75450a5c87d6db0a01ac618611b02783 SHA-1: 7ec746f19159053cd3e66a149c5ae6c16c588c56 SHA-256: 4ca30135949dbb8057df521d68edd06fbb3aab13d1e5532e1dde45c6a6012409
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated, but the presence of external links suggests a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ponafet.ru/strik?utm_term=wordpress+wp-admin+not+showing+up
    • http://hookup158.fun/loweknhaka.pdf
    • http://obsluzhivanie-kompyuterov.moscow/2d_battle_simulator_modm092f.pdf
    • http://oficialshoes.site/beseler_23c_iii5b3su.pdf
    • http://discout.online/how_much_does_a_regional_manager_make_at_planet_fitnesszjhuk.pdf
    • http://m-ryanaf.site/zoruzakazazuxalaribubio6v94.pdf
    • http://cooldomen.space/nudanisozikunaesi.pdf
    • http://samo-katim.ru/25106662207yskzw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9f4ad419-87ad-4507-9b23-40b7c7395cc9.filesusr.com/ugd/55478e_47de4ddaa39d4a30aeb16f210759cb79.pdf?index=true
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_ee84e501ac7347388c9ee6bace539e3b.pdf?index=true
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_a209c0dea3bf4b68b286306a49d70eeb.pdf?index=true
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_07fab687792c448ba1c143269a058bf4.pdf?index=true
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_0757d21a4541444ba2fbc1d93e902ece.pdf?index=true
    • http://gataluxogawix.epizy.com/17653407011.pdf
    • http://gorulilul.rf.gd/vevogu.pdf
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_03df8e481fc94fa2aa613916941871a0.pdf?index=true
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_cf5c553c78ce47cabc37ac940f5f803a.pdf?index=true
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_e1435ae4a7f640c083bc70f5974a612f.pdf?index=true
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_5106f1218a834e3aa9a2c446139e2405.pdf?index=true
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_bdbdd3509f2b4d04a83b0293e6183fae.pdf?index=true
    • http://kepepisex.epizy.com/aa_as_bill_sees_it_topics.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_off0000fe68.bin
33833a885d7350ad3b272b9339d81ecea9ffc49f0efa5a4cef6c42d3437401c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 5480 bytes
font_01_sfnt_off00011100.bin
6869f19da0e727aa4a317e9ea9a8065aa7171dce10bc9bf9a747ba2f045548ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 10924 bytes

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