Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa317bd56eecae9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-12 16:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e75073a7a91df7b52ac4fb51eca18806 SHA-1: 62cc11e94e4fc4b5a9df70d27e7537aa60a8dcee SHA-256: afa317bd56eecae9b164d8501253a0757ee80c5c83509c3bae9a8d1566b33eb1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute malware via numerous small, non-clustered links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=mipmap+android+developer PDF link annotation
    • http://konemara.hu/userfiles/file/91905711364.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/banabulokeruxapegedaz.pdfIn PDF document text
    • http://safetruck.gr/images/file/31401203273.pdfIn PDF document text
    • http://logicamail.it/draft/media/vasunebuzavewefafiler.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/fanumogu.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/40725589137.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/53111945730.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/90787973658.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/75484646675.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/vurumikubejo.pdfIn PDF document text
    • http://esangsok.com/upfile/files/13688672080.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210912195456.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/vifipo.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/laworekeboranelogomid.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/zawezolukenegifuxoratakug.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/25722300578.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090602232710.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/50810037646.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/45875787279.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/76303762672.pdfIn PDF document text
    • http://paliukenas.lt/i/File/46963713091.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/saxibovujipafadaz.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/67449011311.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 17156 bytes
SHA-256: bf37f748a020d3d14f5b391397a7d74cb436337574e69b4727c3107bd083fa4c
font_02_sfnt_off00010dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCD 10348 bytes
SHA-256: c41e04ac4c5d35050105102abf1842ec0de7f007ca1166cd0b2845f302601885

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