Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01d3dee6c35b466…

MALICIOUS

PDF

76.2 KB Created: 2021-05-02 07:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c435881dc182419157ea355340dd24e SHA-1: 95a2fe7fe1272b8abaaf0052212100d31c9068ea SHA-256: a01d3dee6c35b466821277714f8e12e4ae966fba43c5a6b426f52d478d790171
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, including one pointing to 'jacksth.ru', suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jacksth.ru/strik?utm_term=how+to+auto+format+fractions+in+word PDF link annotation
    • http://dmdmassage.com/67670768941wpth4.pdfIn PDF document text
    • http://penodesige.iblogger.org/4_qul_and_ayatul_kursi_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bufilimel/ciiha1e/75077791141.pdfIn PDF document text
    • http://bagevelotalapam.22web.org/ganogil.pdfIn PDF document text
    • http://lestyprin.online/tufenefeii52b.pdfIn PDF document text
    • http://nadahul.ru/300_best_canadian_bread_machine_recipespxf2v.pdfIn PDF document text
    • http://monongzhlh.space/rilamorimoriewwh4.pdfIn PDF document text
    • https://cdn.sqhk.co/bivaxijo/4kUFhbt/kitchen_family_style_popovers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_4bf11d842e5645dbba57cab91ea8fdbd.pdf?index=trueIn PDF document text
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_2b94eacbfea44150ba8ae15fbfb836a6.pdf?index=trueIn PDF document text
    • http://dabizoxirodili.rf.gd/16505296648.pdfIn PDF document text
    • https://aaf2f8d8-4593-4070-95c3-ed2308805076.filesusr.com/ugd/337eea_ef07165b15b2467f9ca376f4cfb38e79.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_8d6297dfef60497f843d4d9614173342.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/nebenemebifirujizuvazuja.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/what_is_the_main_purpose_of_oxygen_in_cellular_respiration.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/83952393603.pdfIn PDF document text
    • http://lozunina.epizy.com/malformation_anorectal_nouveau_n.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_4c542844531d4f318689ba62e6ea352c.pdf?index=trueIn 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_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 5188 bytes
SHA-256: 0c92d6e5c8a7dc2b57525c84eafe02ba7f18f2728e5948c039cdba3979f49ebc
font_01_sfnt_off0000fbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAB 11916 bytes
SHA-256: 0b06455a13cbbc3f821a6d1291b853f73c327485c54d61501d0755e583aa8783

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