Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6cdef6ed58e526…

MALICIOUS

PDF

77.3 KB Created: 2021-03-15 23:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0922ebd19703ae12af04f666fb39dd2 SHA-1: 413a7e750d3324e92fa205f4b40095c7bee2315b SHA-256: 3d6cdef6ed58e526ebe46eebc16e0c93249a7439922a3ff12fb9663ce762f63f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of external links point towards a T1566.001 (Spearphishing Attachment) attack pattern, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://resalured.ru/strik?utm_term=accu+chek+performa+e7+error
    • https://boxatikavizag.weebly.com/uploads/1/3/4/6/134680825/980ba1cf3b9f45.pdf
    • https://debesawoxud.weebly.com/uploads/1/3/0/7/130775383/rokovutujiloje_daguw.pdf
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/wiwagibagusexapade.pdf
    • http://xivasupati.iblogger.org/adjective_modifiers.pdf
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/c18d68fcc35.pdf
    • https://pebizenif.weebly.com/uploads/1/3/0/8/130874023/0c0b1593.pdf
    • https://nuxelimifa.weebly.com/uploads/1/3/0/7/130776070/milevizumezaxar_lezubuposile_zitagibuk.pdf
    • https://vudeberas.weebly.com/uploads/1/3/3/9/133997553/9617299.pdf
    • https://terifebi.weebly.com/uploads/1/3/2/8/132815785/8496403.pdf
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/kewim-gixitojiwanomi-pivoxanunozoja.pdf
    • http://nuwefug.22web.org/sofirusopod.pdf
    • https://fekoguto.weebly.com/uploads/1/3/4/4/134491689/6842929.pdf
    • http://mirinodok.iblogger.org/john_winchester_journal.pdf
    • https://pimazapodozem.weebly.com/uploads/1/3/2/8/132814260/finawifuwozebixoxete.pdf
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/2783808.pdf
    • https://gekubele.weebly.com/uploads/1/3/2/6/132683169/a18efa9be94f99e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_6cde38f55d1e425dbd95db8642e7c1b5.pdf?index=true
    • http://kikebunubalexu.rf.gd/42126107864.pdf
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_35920a0007d04e1ebcf26b89c631954b.pdf?index=true
    • http://givemuzod.epizy.com/charlie_rose_hollywood_reporter.pdf
    • http://xuzejoleja.rf.gd/what_happens_to_trs_if_i_leave_teaching_illinois.pdf
    • http://jilutuve.rf.gd/viwasaluterivuvom.pdf
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_17d0d2bacdcf44de84c7a2dd42fbfdc6.pdf?index=true
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_ce0d3b40e33843ba96f1fc9e3d2e2936.pdf?index=true
    • 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_off0000eaef.bin
bab0636ef1ab6ca134f8cff709a926ff96835995c0ff39a5e95193cc27fb07f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 5176 bytes
font_01_sfnt_off0000fc6e.bin
226f1eb88bd03f7f83c035cc512b2248cbfd548b3ea7957a40bf335f134be457		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 12840 bytes

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