Malicious PDF — malware analysis report

Static analysis result for SHA-256 911a44ca45fa9b4a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 18:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a45f5720a3ca9069fce02349afef386 SHA-1: 95b417b7eb25b4742cecc192db93a0344a4fc6e0 SHA-256: 911a44ca45fa9b4ae9e886ab812669072793385202d39611bb76ffd15d15c9c0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs point to a link farm strategy, likely used to obscure the true destination or to distribute phishing content. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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 http://cukrarska-vyroba.cz/UserFiles/File/xuxudemozununujisu.pdf In PDF document text
    • http://asr-net.ru/uploads/files/soran.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/42499321308.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/15560085059.pdfIn PDF document text
    • http://techmechengineers.com/uploads/12233677007.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/39765072230.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/zasates.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3d7c7f2b9f894f74cb82a862c8510804/xirizijezo.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/giruz.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/65936318953.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/8199503118.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/tavimefeteluzebitere.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/xibozavatasirov.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/95172598669.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/13330204052.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/mowinorujodesaw.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/witebimajivenopibaw.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/domuluninumorabuwajalegek.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/leguzezumobilorenani.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/13533769931.pdfIn PDF document text
    • http://stattus.com/assets/file/parunobekoboro.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/lodanunibebeleromatisu.pdfIn PDF document text
    • http://chineseclothingonline.net/File/woninewasafizelejanifofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=after+2019+stream+onlinePDF link annotation
    • 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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 17516 bytes
SHA-256: f076100ba028a8c13ea67b41c128ce856e6366c6fd8ad1004f82a6c1a1490079
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 10820 bytes
SHA-256: 932afa5048179e28c615b637e7af8651da94d035bb6e74e84abfee5b525c92a5
font_02_sfnt_off00011df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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