Malicious PDF — malware analysis report

Static analysis result for SHA-256 b058640d7c72d158…

MALICIOUS

PDF

82.9 KB Created: 2021-03-05 19:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ddb77636acec45199a06e0d6d62f4402 SHA-1: e8f83d86ad0b53094020f7b11172ffd8b419ab27 SHA-256: b058640d7c72d1584de407e841d1893be63742eaccbd9a8b73c812a8da6de91f
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 pointing to benign-looking documents, but one prominent link to 'jacksth.ru' suggests a potential redirection or phishing attempt. The 'PDF_SEO_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links, which is often associated with SEO manipulation for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=what+is+mil+std PDF link annotation
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/vinigubutigijivasufa.pdfIn PDF document text
    • http://sejujijowevazuk.iblogger.org/8040144877.pdfIn PDF document text
    • https://cdn.sqhk.co/jeforije/jdihjhi/10307104292.pdfIn PDF document text
    • https://xepapure.weebly.com/uploads/1/3/4/3/134367208/6251e53.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/NiiUyUO/live_space_battle_wallpaper.pdfIn PDF document text
    • http://dixuvexawob.22web.org/paselobulajoxavod.pdfIn PDF document text
    • http://xazerakovewule.22web.org/3249543878.pdfIn PDF document text
    • http://netarowivon.iblogger.org/28363949667.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/zamuriza/combinations_and_permutations_worksheet_algebra_2.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/menijubuwakomurogafozif.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/bernette_705a_sewing_machine_manual.pdfIn PDF document text
    • http://lawakeweba.epizy.com/celebrate_me_home_the_perrys_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/whatsapp_status_love_in_marathi.pdfIn PDF document text
    • http://zuzofigub.rf.gd/lejagolubotolafuf.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/windows_xp_startup_repair.pdfIn PDF document text
    • http://gumofiwulova.epizy.com/59977572634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6684922-2fea-467d-a370-92fcd3eee823/72728925039.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/lemadeterinoguzal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/671317da-50df-4ce1-ad76-b53e23af960b/robarazufupibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63945256-7b6c-454f-aaa6-01e8df0c50bb/62145399675.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_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 4984 bytes
SHA-256: ede4da7448c34d1f6e290c1cb336a6bba20d4ed89066619492f62d0bacb6314e
font_01_sfnt_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 10796 bytes
SHA-256: a4bdfe00526f1d998f5de26dccde12b5695df2c071ec1059a2855581af0a3f06

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