Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcc4a9710f6e456…

MALICIOUS

PDF

83.8 KB Created: 2021-03-18 00:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2fa19f72029947433ce98a2b2fddbe01 SHA-1: 411f919d57780e80b5b059d681a98ca46553e81b SHA-256: cfcc4a9710f6e456910dfa703cdc5724fa1f2357a72d697e7b1cb5bf82de2d25
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a PDF link farm containing numerous external URIs. The ML classifier also returned a high confidence score for maliciousness. The primary attack pattern involves directing users to a network of websites, indicated by the presence of many external links, some of which are associated with SEO link farms. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to exploit users through malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/award?keyword=sp+hybridization+pdf PDF link annotation
    • https://tinonerapize.weebly.com/uploads/1/3/5/3/135349756/0907048e.pdfIn PDF document text
    • https://notojusuwetu.weebly.com/uploads/1/3/1/8/131871856/famopig.pdfIn PDF document text
    • https://nobasaxekomu.weebly.com/uploads/1/3/5/3/135322761/8615400.pdfIn PDF document text
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/4925379.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/0f64b668637.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimofizamar.epizy.com/cardiovascular_disease.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/sharp_aquos_android_tv_4k.pdfIn PDF document text
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_3b8ce76af3dc46f590ad962e3fda48ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petubapizo/47707425963.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/blogger_template_maker_online.pdfIn PDF document text
    • http://fevanazenanow.rf.gd/23264406878.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/adenocarcinoma_in_situ_cervix_guidelines.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_dcd9e701d9f24358a87505d9b8cc5459.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/begijufadi/dark_chocolate_movie_free.pdfIn PDF document text
    • http://vunatilun.epizy.com/24193061386.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/gifudafolatem.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/masonic_catechism_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/71729389517.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/14646047990.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/informal_letter_writing_worksheets_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/liszt_beethoven_symphony_5_sheet_music.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_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 5312 bytes
SHA-256: b1502dbaf04f7b450ee5d44112825ef57bc88cd52746b543ff487406453dd8c1
font_01_sfnt_off000119e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 11900 bytes
SHA-256: 94fd537c26991f5c24b0ae474b75986d30a5e45716fe80683d6b00f5251d9378

Open this report in the interactive analyzer, or submit your own file for analysis.