Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dedc1b831ce313f…

MALICIOUS

PDF

76.3 KB Created: 2021-04-02 17:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 749c1e42b047c7c97f9a0603d932f6b9 SHA-1: 7e49e8c51f3dbc125568ac5063facb6954649c97 SHA-256: 8dedc1b831ce313f9aa100ae22f44187957c6bcb606a19352be0686d3af2539e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains numerous external links, likely for SEO manipulation or to host malicious content. The embedded URLs, such as 'https://xezojetit.ru/123?utm_term=firefox+50.+1.+0+mac', point to suspicious domains, further supporting the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=firefox+50.+1.+0+mac
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/2989388.pdf
    • http://befakupamexi.iblogger.org/langage_des_signes_francais.pdf
    • https://dasowafajego.weebly.com/uploads/1/3/4/7/134723411/keziko_kuromexe_xolepunuko.pdf
    • http://tedisesux.22web.org/free_html_email_template_receipt.pdf
    • https://rutemaja.weebly.com/uploads/1/3/1/4/131438840/didutebumu.pdf
    • https://nabebumiz.weebly.com/uploads/1/3/1/4/131452902/585868.pdf
    • https://musabonaxuzu.weebly.com/uploads/1/3/2/8/132815830/rijetikezolus_fiwakubalo_gopugevasebeda.pdf
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/lineluwavo.pdf
    • http://papotupeti.iblogger.org/jarif.pdf
    • https://pesefusuf.weebly.com/uploads/1/3/4/4/134486856/60708.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_5dfe8f6679764f6fb5979402f20aa2b7.pdf?index=true
    • http://nebiviteg.rf.gd/stay_strong_demi_lovato_book.pdf
    • https://uploads.strikinglycdn.com/files/9ac97fac-6529-4a0d-9c58-d245d60129d0/34348111285.pdf
    • http://kokidudelilusib.epizy.com/apple_ios_beta_profile.pdf
    • https://uploads.strikinglycdn.com/files/7103cab6-5ca6-4261-9f6b-c40975601e97/siemens_plc_programming_basics.pdf
    • https://uploads.strikinglycdn.com/files/611bf6b3-7f57-45b7-9e77-dd8380434870/gerund_or_infinitive_exercises_elementary.pdf
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_502f2659c47144e3a8cfdd71000c19f9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0163ba8-9d2c-4400-9a10-78bf159c3e7c/soxexor.pdf
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_8fcd19a21ea84f4abbd65657cf4730ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f5f5f549-aa25-44e2-bd43-50f4235af178/40283847926.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_off0000eb63.bin
4cbf6af9d406bd25e40afa42209a52683d03c47a564c19a80cd315a3ad0c3f01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 5192 bytes
font_01_sfnt_off0000fd0d.bin
57265cef72b17b02846ea8a36384f441fa7653b9908b92853679a2d17d882ad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 11432 bytes

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