Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7bbd3b9129caec…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 22:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 127de7639c07eadc053877ea202d2a30 SHA-1: 00d9c9e8c8451f4e697d70bd67d0b047b6d6b9c0 SHA-256: cd7bbd3b9129caecbc1ded49886fe6230a870af9f0765ff771bdd5e4c4c81446
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm designed to host many links on disposable domains. The embedded URLs, such as https://ketchas.ru/uplcv?utm_term=texting+story+apk+hack, suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=texting+story+apk+hack PDF link annotation
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/236148376.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/jutepefalovezetisujo.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/wudapesidiga.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/32747045983.pdfIn PDF document text
    • https://awinresource.com/uploadfile/file/vatepanaja.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pamaxeze.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/49249009557.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/502315634.pdfIn PDF document text
    • http://lj-group.cn/upload/files/67793526033.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/jonasoduruturibebodog.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/59910326646.pdfIn PDF document text
    • http://tradotel-riviera.com/file/77407261269.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8a164922e5d0365c36872260fe51c1d9/lamakopogonupekomebobuti.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/49696479078.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/72552370150.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dbe8542bb---97404352991.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/kasifo.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/winupazol.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/fevezefugipokuxalo.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/22196886752.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tazoxafun.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/96385954027.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/lolubirelazixowotimewob.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/vugegovarolodilivatubidam.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_off0000d9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CE 19672 bytes
SHA-256: 493a6bd00663713067b3d99e8f420c3323ce926db45ebdb41f95d27d1374e418
font_01_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 10880 bytes
SHA-256: 47eb9ae79e02651088aa9ea9d2f925ca3b3ca306d9127ac9f60edfedcb8fb812
font_02_sfnt_off000127aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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