Malicious PDF — malware analysis report

Static analysis result for SHA-256 596cde7975514c33…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 03:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83aee59598fe91ee9f04455f4cc6aad8 SHA-1: f95fa7d7d8936eb3303740c1177729469b86e609 SHA-256: 596cde7975514c33ffaab0cffe74f2d91b51d2b7fc7f96c3f5fe45511be6f584
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pistant.ru/uplcv?utm_term=market+android+tv PDF link annotation
    • http://itkaufmann.com/images/fckimages/file/luxovenedugerezugawad.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131f488840---1221155879.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/28910897754.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/ragavotudu.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/fulunimurinevivijux.pdfIn PDF document text
    • http://orem.mn/uploads/files/65146462716.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/2296413058.pdfIn PDF document text
    • http://electric-kernbichler.at/24108009816.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/9454196931.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/16442726703.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/73267115793.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/57894232222.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/xuxunijivewudetijobujinoz.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/18453876076.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/18639403688.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/76324252630.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/mikiredozojoxifexus.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dokogifefidadoti.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/94686289063.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/70805367422.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/2697386440.pdfIn PDF document text
    • https://coil.hk/upload/files/vibixot.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/sazutibilijabufetujusu.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/27710123561.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/27731263486.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_off0000d738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 10176 bytes
SHA-256: 4dd80d8227691793706d29ff2bb0d08bc2d616eaf70080362b77bb9931282e8e
font_02_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 18452 bytes
SHA-256: 5189fef3fe012ff2c20002eb8c18602fbd5c166dfb853bf339d2c7d624169f16