Malicious PDF — malware analysis report

Static analysis result for SHA-256 5730f48ec22ee6db…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 09:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd6357c9e9aecb64869b1a03ccf46c81 SHA-1: 2885183905eb5fe1821ae94c56a6407c1e523fa9 SHA-256: 5730f48ec22ee6db1bdcd690cdeae9c4ffed2e98d6743d00a7d1310be232e382
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and forming a link farm, suggests a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards exploitation and potential delivery of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sarkar.ie/userfiles/file/kemuzuxadasa.pdf In PDF document text
    • http://titusauto.hu/kepek/file/nawugimigevaxomibifeg.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/89292688831.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/97069324996.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/nupowebipisojedewedus.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/tujodolidibiganakelofu.pdfIn PDF document text
    • http://health-bridge.in/upload/file/jokupejunufoduvolibasan.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347c9961758---gadidigarexitopopi.pdfIn PDF document text
    • http://regcureguide.com/files/files/jetedesazawukozuvok.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/65371915475.pdfIn PDF document text
    • http://youil.org/userData/board/file/12660684929.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/mesorologosokeko.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/18014209902.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/33838295021.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/24006781174.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/pokepin.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zitaretatebeneragedore.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/93109444793.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/dozinumufokuwimeke.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613db85fcca0c---24033413970.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/tulaluwunidonimitoramu.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/49433196878.pdfIn PDF document text
    • http://askort.pl/Upload/file/xinajotigituwako.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/pozozefolej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=x+plane+app+for+androidPDF 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_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 10232 bytes
SHA-256: 53ca053e31f394acb1e9b4eaebcf47181b60920fd2da58e8320b01156391870a
font_01_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_02_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1