Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ba69ae0eea26a9…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 11:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f15ed4f56267b7afe5478c8f27fe782f SHA-1: b319c93984d254efcf3d627d1cf0c207b4aa7134 SHA-256: a5ba69ae0eea26a90022d39d08e462999f74717f58a79fed2d3d6b15e4774a79
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that redirect to other PDF files, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting, likely intended to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://wastran.ru/uplcv?utm_term=why+nations+fail+ebook+free+download PDF link annotation
    • https://qian-ho.com/upfiles/editor/files/zitobiromibesu.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/kamerudovinofiniwu.pdfIn PDF document text
    • http://podarox.ru/public/files/tuvefupoxazedetutodivoned.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210906021417710026id7ix.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/torurafijepo.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wodutadawonogapopukojisu.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/89296093450.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/nirikusijururuj.pdfIn PDF document text
    • http://smirna.pl/files/file/niwumidemom.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/13ee3e708cb17a23a0dd41ff7d09776a/zemokatagowuf.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/24351497530.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/52895316153.pdfIn PDF document text
    • http://orthodoxnews.us/file/20351201800.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/xadotokulubilitedokodiduf.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/pizafemamobaguzoxavop.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/7035266856.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/sebuvemide.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/27744172953.pdfIn PDF document text
    • http://veitali.com/upload/files/24461424819.pdfIn PDF document text
    • http://irinabailey.com/upload/files/46301428603.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/43571527927.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/55094581557.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/29033941997.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/jotakojutigududajiduzul.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/zeforopogirudokove.pdfIn PDF document text
    • http://mlight.cz/archiv/file/bizufapurejekas.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_off0000bb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB68 10876 bytes
SHA-256: 1774ed1b018da1fec31060c5cc996f47dab248a909c64d02b60c0d4f3862190c
font_01_sfnt_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 16688 bytes
SHA-256: a1f84c3f4c7024b499f417bd1a4c2d5c0d8e2acfc1207fa6a4a34bd39e9e4227