Malicious PDF — malware analysis report

Static analysis result for SHA-256 6800493ea0410ae4…

MALICIOUS

PDF

104.0 KB Created: 2021-03-17 16:01:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8e47a5e5b8505939ab63622e2b521ff7 SHA-1: 24796aebc112c48744c281a0ddf7b7476a224032 SHA-256: 6800493ea0410ae47e33ffb9bd855c84d71f444509883fa155494830c13776c4
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to an 'answer key', directing users to potentially malicious URLs like https://maypoin.ru/strik?utm_term=answer+key+dna+base+pairing+worksheet+answer+sheet.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://maypoin.ru/strik?utm_term=answer+key+dna+base+pairing+worksheet+answer+sheet PDF link annotation
    • http://monanuzusud.22web.org/dazejala.pdfIn PDF document text
    • https://cdn.sqhk.co/nodujugebi/GjCjihf/virosis_meaning_in_urdu_name.pdfIn PDF document text
    • http://mazusipitazozi.22web.org/31692324919.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/Kjbjfmw/348437141.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/jiohcjb/xeweposob.pdfIn PDF document text
    • http://rupasuwejex.22web.org/free_pre_employment_assessment_test_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/ifghM0k/threads_pour_instagram_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/R4IjguM/febupuzijopewemibufenoz.pdfIn PDF document text
    • http://wajoxur.22web.org/biosensors_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vepejatudededok.rf.gd/duchess_of_malfi_monologue.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_8d810692b32f4d93870ffcf2e5afa98f.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_58060cc67af54f4d81276756d00c9a5b.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_eac80238cda7424897ecbdfa375feed7.pdf?index=trueIn PDF document text
    • http://tereneduzoz.epizy.com/59022459737.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_7a4a63a59301439fbc7576c354066d41.pdf?index=trueIn PDF document text
    • http://ziwatepubapusu.rf.gd/descargar_calendario_2020_argentina.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6892985d5ebe44e1b526add8c5b51226.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016ad6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16AD6 22808 bytes
SHA-256: 27102feb947189efb423b65632b6a466abcb8671d10f5fbde9b74e1413927ce7
font_00_sfnt_off00012b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B74 5576 bytes
SHA-256: 230651fe1c61d900e608646df0bdbb301be7cd25b1b2f0fa5dd67b9ee2e11865
font_01_sfnt_off00013e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E81 13440 bytes
SHA-256: ea53b6588361704b73a372a4564f1a06cda167f091e23192d561e59f5d530621

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