Malicious PDF — malware analysis report

Static analysis result for SHA-256 31958edc5434cc04…

MALICIOUS

PDF

84.8 KB Created: 2021-03-20 21:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b4b8607faa8af4821feade84b8381c SHA-1: 7ba10047bd5d7978f1e67531aba300e5e61e408f SHA-256: 31958edc5434cc040424a6c72d6ece9d7ce3ff81767458a985cb6721390710d2
136 Risk Score

Malware Insights

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

The file is a PDF containing embedded URLs, one of which is used as a lure for popular media content. The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic for password-protected archive lure suggests the document may be part of a multi-stage attack, potentially involving encrypted payloads. No scripts were extracted, but the presence of embedded URLs and the overall detection profile point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/wix?keyword=running+man+best+episodes+2013
    • https://cdn.sqhk.co/lakekomum/aifehhj/74718445927.pdf
    • http://liketime.online/rixesumuligokex7ufb.pdf
    • https://cdn.sqhk.co/padezeda/cRihy6X/76739456947.pdf
    • http://timelessdecorum.com/delta_q_1500_charger_manualgsnl1.pdf
    • https://cdn.sqhk.co/woferomot/jQNRZia/70437176185.pdf
    • http://xajavawinereko.mywebcommunity.org/11195077925.pdf
    • https://cdn.sqhk.co/filajokajemu/UIwXNib/mobewabiragomedusexuxi.pdf
    • http://keepmaxi.space/lexus_is300_2jzgte_swap_automaticbhhht.pdf
    • http://ygrash.website/print_ascii_number_pythonhl2cx.pdf
    • https://cdn-cms.f-static.net/uploads/4382429/normal_600e98c4935ed.pdf
    • https://cdn.sqhk.co/duxadikoti/pH3iehd/zuzukofopesiju.pdf
    • http://mazipuvaxa.mywebcommunity.org/aprendizajes_clave_preescolar_programa.pdf
    • https://cdn-cms.f-static.net/uploads/4461207/normal_604bb2ec737aa.pdf
    • http://penibibujobufux.iblogger.org/sivosi.pdf
    • http://ecoservice-vlad.ru/43697610382ki5m.pdf
    • https://cdn-cms.f-static.net/uploads/4471941/normal_601b578e61b48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_08b34a3017654ca28a506a44db802e6b.pdf?index=true
    • http://dezinolabebosod.atwebpages.com/litadulobonepodamironuti.pdf
    • http://zelalosiker.rf.gd/axis_bank_statement_form.pdf
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_7874d5c706324b158d0b3c439b7d5b0f.pdf?index=true
    • http://sobogasitizi.epizy.com/zotugewuget.pdf
    • http://nokemufebevezo.rf.gd/89375555256.pdf
    • http://suwisekuxowiw.epizy.com/no_fear_shakespeare_the_tempest_epilogue.pdf
    • http://dakafatuvuguviz.atwebpages.com/92331161209.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fefb.bin
0497bba1c4635d2c060bcc6690bd43150f99a57489396ca38d7d645e71251f15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFB 5788 bytes
font_01_sfnt_off00011298.bin
6feae600816abf1bc5af351fc67f77c29147a154af04638e5d7145d083d074dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 2208 bytes
font_02_sfnt_off00011cbd.bin
b44c30d5111f0d5422c87d2dd7fdf939d20782b9cdfc8aedbd315c07258efe90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 11520 bytes

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