Malicious PDF — malware analysis report

Static analysis result for SHA-256 93765d7af2a955b7…

MALICIOUS

PDF

81.8 KB Created: 2021-03-11 19:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 504fb53138c4e18635aaa6f4f5a5e08c SHA-1: 2ba86eb8904e1d0a32440753d9d90cdf38afbc4b SHA-256: 93765d7af2a955b74c6750d04848eabbdf86a73227a11f9f29d29fb540931d15
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDFs, but one critical heuristic identified a link farm designed to direct users to a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/strik?utm_term=lusus+naturae+characteristics PDF link annotation
    • http://bodyita.space/xezukujadotuganafefin3xpp.pdfIn PDF document text
    • http://gratoramaa.website/what_is_the_strongest_fishing_line_knotw6imt.pdfIn PDF document text
    • http://fowozomogijib.iblogger.org/ludejibivurikivukumuro.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/down_and_out_in_paris_and_london_audiobook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pigolo/zimonelukutasaw.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_07dd4d0396614c308c46bd00f938a720.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/critical_thinking_behavioral_interview_questions_and_answers.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_0293eada1eb74265a066dadd2fd8429f.pdf?index=trueIn PDF document text
    • http://tuxijug.rf.gd/38386464839.pdfIn PDF document text
    • http://topemuzopapegu.epizy.com/13270464557.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/rosorekapozetodozimut.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/agneepath_video_song_full_hd.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_739aa786926d42ccaf394fbf758b1ece.pdf?index=trueIn PDF document text
    • http://xugekevilop.rf.gd/how_to_open_ms_paint_link.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_079738b85d8044eea8c80dc18d7bcc3f.pdf?index=trueIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_b1b8985bfa2f4a5eae4a5b2f490cc881.pdf?index=trueIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_ef06d7bce183461baa133d14e457498f.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_21606e8183b442d6b841bf99462767bc.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_98ffcc35dd624ce9bdcf553f59b4ec78.pdf?index=trueIn PDF document text
    • http://muvaxuzuf.rf.gd/91483034791.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/tolejopesupuwer.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/rabopezokozaxudegawutoli.pdfIn 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_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 4796 bytes
SHA-256: 3321406bd8f64dbdbbb9469594bd3a82915497af5242fba0ea4fdd6b74985788
font_01_sfnt_off000114c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C4 10900 bytes
SHA-256: 0b1375b13097211970406382dfcac20fe1cfc6954c15b21ad3c0f7cafc46e825

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