Malicious PDF — malware analysis report

Static analysis result for SHA-256 56af710d334618e1…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 14:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9476f937f34a9b518693f0aae83b46b5 SHA-1: 80f91bdef10c24cffb035c00310f8ae8101cde47 SHA-256: 56af710d334618e1f6155e0e238a0b63e90ec385da95a3a6fa016ebdd173d902
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a 'PDF link farm'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious sites. The presence of embedded URLs and the PDF structure suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=how+many+antennas+do+dragonflies+have
    • http://nonowun.mywebcommunity.org/forukofu.pdf
    • http://kuzexamipapoxip.medianewsonline.com/for_the_first_time_piano_sheet_music.pdf
    • http://xebiniseba.mygamesonline.org/lipokufojijeguzibifiwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/305c9e29-8d5e-41b6-a3e5-3e1d04a983c7/computer_service_price_list.pdf
    • http://gabotemoba.epizy.com/bangla_natok_songsoptok.pdf
    • http://velezopabojejar.rf.gd/lang_linear_algebra.pdf
    • http://kodowemomi.rf.gd/classical_myth_8th_edition_global.pdf
    • https://uploads.strikinglycdn.com/files/42ef0d67-f7de-4a4a-a00b-7873aefa204a/what_does_an_it_systems_engineer_do.pdf
    • http://robowogutalopet.epizy.com/seguferevesovaroviwu.pdf
    • http://xobebol.onlinewebshop.net/xopikunesonisesaxubusorex.pdf
    • https://uploads.strikinglycdn.com/files/cc43841a-197f-42a2-81ec-2d8808370753/microsoft_project_management_software_certification.pdf
    • https://uploads.strikinglycdn.com/files/68d3af0e-2148-4c9d-9699-b4b56fa948c4/how_many_nancy_drew_files_books_are_there.pdf
    • https://uploads.strikinglycdn.com/files/916b8127-b265-42bb-bfec-2824832e1082/62280859615.pdf
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_ba9bd265ecfc4a83ac3a849e5f570697.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fbfbd3e7-320a-420c-8434-bdd3e1e49778/98008107647.pdf
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_704f5d270ed64101a5e22db0dd4942f0.pdf?index=true
    • http://rufegojokod.epizy.com/angular_6_reactive_form_disable_control.pdf
    • http://nobapizasiwe.myartsonline.com/bumofafan.pdf
    • http://wixudilasajigil.rf.gd/31822370778.pdf
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_f70cf96272994cac998bf9667cc4a29b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c2202092-22a2-4138-8229-0741db4dda21/94334603519.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_off0000f778.bin
c0a550c6eb6f59c4a5bb19b7cdf95ccab1afbd314f990d4f1fa91b323cb6d10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 5536 bytes
font_01_sfnt_off00010a38.bin
5a61a0ef2f1f29f490fff2eb070bed0f0c7055b959d2b694b6f2b691f7ce1297		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 10376 bytes

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